Target Mathematics

Past-paper practice

Surds and Logarithmic Functions: Topic Questions

54 questions with mark schemes.

1.1: Estimate roots using a graph

4PM1/1/November/2025 — Question 8 · 12 marks

1.1 diagram 1
(a) Complete the table of values for y=3x−2y = 3^x - 2 giving your answers to one decimal place.
xx-1-0.500.250.50.7511.52
yy-1.7-113.27
(2)
(b) On the grid opposite, draw the graph of y=3x−2y = 3^x - 2 for −1≤x≤2-1 \leq x \leq 2
(2)
(c) Use your graph to obtain an estimate, to one decimal place, of the value of log34.5\mathrm{log}_3 4.5
Show clearly how you have used your graph.
(3)
(d) By drawing a straight line on your grid obtain an estimate, to one decimal place, of the root of the equation log3(8−3x)−x=0\mathrm{log}_3(8-3x) - x = 0 in the interval −1≤x≤2-1 \leq x \leq 2
(5)
Only use this grid if you need to redraw your graph.

1.3: Logarithmic equations

4PM1/1/June/2025 — Question 10 · 11 marks

Solve the equation
(i)log4(6y−5)=3(i) \mathrm{log}_4(6y - 5) = 3
(2)
(ii)log4(4−3x)2−log2(x2−5)−3=0(ii) \mathrm{log}_4(4 - 3x)^2 - \mathrm{log}_2(x^2 - 5) - 3 = 0
Show clear algebraic working.
Give your answer to 3 significant figures.
(9)

1.4: Surds and rationalisation

4PM1/1R/June/2025 — Question 1 · 3 marks

(8−6)w=50(8 - \sqrt{6})w = 50
Without using a calculator, find the value of ww
Give your answer in the form a+b6c\frac{a+b\sqrt{6}}{c} where aa and bb are integers and cc is prime.
Show your working clearly.
(3)

1.5: Estimate roots using a graph

4PM1/1R/June/2025 — Question 7 · 10 marks

(a) Complete the table of values for y=3log3(x2−x)−2xy = 3 \mathrm{log}_3(x^2 - x) - 2x giving your answers to 2 decimal places.
xx1.31.522.533.5
yy-3.79-2.11
(2)
(b) On the grid opposite, draw the graph of y=3log3(x2−x)−2xy = 3 \mathrm{log}_3(x^2 - x) - 2x for 1.3≤x≤3.51.3 \leq x \leq 3.5
(2)
(c) By drawing a suitable straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation
343x=9(x2−x)3in the interval 1.3≤x≤3.53^{\frac{4}{3}x} = 9(x^2 - x)^3 \quad \text{in the interval } 1.3 \leq x \leq 3.5
(6)

1.7: Estimate roots using a graph

4PM1/2/June/2025 — Question 7 · 10 marks

1.7 diagram 1
(a) Complete the table of values for y=log3(4−x)+3y = \mathrm{log}_3(4-x) + 3 giving your answers to 2 decimal places.
xx00.511.522.533.5
yy4.2643.6332.37
(2)
(b) On the grid opposite, draw the graph of y=log3(4−x)+3y = \mathrm{log}_3(4-x) + 3 in the interval 0≤x≤3.50 \leq x \leq 3.5
(2)
(c) By drawing a suitable straight line on the grid, obtain an estimate,
to one decimal place, of the root of the equation 32x−5−(4−x)3=03^{2x-5} - (4-x)^3 = 0 in the interval 0≤x≤3.50 \leq x \leq 3.5
(6)
Only use this grid if you need to redraw your graph.

1.8: Logarithmic equations

4PM1/2R/June/2025 — Question 9 · 9 marks

(i) Solve the equation 3(loga9+loga27)=13(\mathrm{log}_a 9 + \mathrm{log}_a 27) = 1
Give your answer in the form a=bca = b^c where bb is prime and cc is an integer.
(3)
(ii) Solve the equation log4p+logp256=−4\mathrm{log}_4 p + \mathrm{log}_p 256 = -4
(6)

1.11: Logarithmic equations

4PM1/1/June/2024 — Question 9 · 9 marks

(a) Find the value of aa such that loga8=34\mathrm{log}_a 8 = \frac{3}{4}
(2)
(b) Show that
3xlog2x−4log168+6xlog48−log2x=log2(8x)3x−13x \mathrm{log}_2 x - 4 \mathrm{log}_{16} 8 + 6x \mathrm{log}_4 8 - \mathrm{log}_2 x = \mathrm{log}_2(8x)^{3x-1}
(4)
(c) Hence solve the equation 3xlog2x−4log168+6xlog48−log2x=03x \mathrm{log}_2 x - 4 \mathrm{log}_{16} 8 + 6x \mathrm{log}_4 8 - \mathrm{log}_2 x = 0
(3)

1.13: Logarithmic equations and graphical solution

4PM1/1R/June/2024 — Question 7 · 9 marks

The curve CC has equation y=−log4(x+4)y = -\mathrm{log}_4(x + 4)
(a) Using the axes below, sketch the graph of CC.
Label the coordinates of the points of intersection of CC with the coordinate axes and the equation of any asymptote to CC.
(4)
(b) Solve the equation log(x+4)256−log4(x+4)=0\mathrm{log}_{(x+4)} 256 - \mathrm{log}_4(x + 4) = 0
(5)

1.9: Estimate roots using a graph

4PM1/2/November/2024 — Question 4 · 8 marks

1.9 diagram 1
(a) Complete the table of values for y=log10(6x−1)−xy = \mathrm{log}_{10}(6x-1) - x giving your answers to 2 decimal places.
xx0.250.511.522.53
yy-0.20-0.30-0.60
(2)
(b) On the grid opposite, draw the graph of y=log10(6x−1)−xy = \mathrm{log}_{10}(6x-1) - x for 0.25≤x≤30.25 \leq x \leq 3
(2)
(c) By drawing a suitable straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation
103x−42=6x−1 in the interval 0.25≤x≤310^{\frac{3x-4}{2}} = 6x-1 \text{ in the interval } 0.25 \leq x \leq 3
(4)
Only use this grid if you need to redraw your graph.

1.10: Logarithmic equations

4PM1/2/November/2024 — Question 6 · 11 marks

(i) Solve the equation 5(logb9+logb3)=35(\mathrm{log}_b 9 + \mathrm{log}_b 3) = 3
(4)
(ii) Solve the equation 3log3x+3logx27=8log41283\mathrm{log}_3 x + 3\mathrm{log}_x 27 = 8\mathrm{log}_4 128
Give your answers in exact form.
(7)

1.14: Estimate roots using a graph

4PM1/2R/June/2024 — Question 6 · 7 marks

1.14 diagram 1
Figure 1 shows part of the graph of the curve with equation y=x+2−(4x+1)y = x + 2^{-(4x+1)}
By drawing a suitable straight line on the graph, obtain an estimate, to one decimal place, of the roots of the equation log2(8−3x)+4x=0\mathrm{log}_2(8 - 3x) + 4x = 0 in the interval −2≤x≤6-2 \leq x \leq 6
(7)

1.15: Without using a calculator, find the value of a and the value of b

4PM1/1/November/2023 — Question 1 · 4 marks

1.15 diagram 1
Figure 1 shows the triangle ABCABC
∠ABC=90∘AB=(2+45)cmBC=(a+b5)cmwhereaandb are integers.\angle ABC = 90^\circ \quad AB = (2 + 4\sqrt{5}) \mathrm{cm} \quad BC = (a + b\sqrt{5}) \mathrm{cm} \quad \mathrm{where} a \mathrm{and} b \text{ are integers.}
The area of triangle ABC=(34+115)cm2\text{The area of triangle } ABC = (34 + 11\sqrt{5}) \mathrm{cm}^2
Without using a calculator, find the value of aa and the value of bb
(4)

1.18: Rectangle sides in surd form

4PM1/1R/June/2023 — Question 1 · 4 marks

1.18 diagram 1
A
(a+b2)cm(a + b\sqrt{2})\mathrm{cm}
Figure 1 shows the rectangle ABCDABCD.
AD=BC=(4−2)cmandAB=DC=(a+b2)cmwhereaandb are integers.AD = BC = (4 - \sqrt{2}) \mathrm{cm} \mathrm{and} AB = DC = (a + b\sqrt{2}) \mathrm{cm} \mathrm{where} a \mathrm{and} b \text{ are integers.}
The area of the rectangle is (10+2)cm2(10 + \sqrt{2}) \mathrm{cm}^2
Find the value of aa and the value of bb
Show your working clearly.
(4)

1.19: Estimate roots using a graph

4PM1/1R/June/2023 — Question 4 · 9 marks

(a) Complete the table of values for y=x2+6e−2x+1y = \frac{x}{2} + 6\mathrm{e}^{-2x} + 1
giving your answers to one decimal place.
xx011.523456
yy72.03.04.0
(2)
(b) On the grid opposite, draw the graph of y=x2+6e−2x+1y = \frac{x}{2} + 6\mathrm{e}^{-2x} + 1 for 0≤x≤60 \leq x \leq 6
(2)
(c) By drawing a suitable straight line on your graph, obtain estimates, to one decimal place, of the roots of the equation
2x+ln(24−5x)=ln362x + \mathrm{ln}(24 - 5x) = \mathrm{ln} 36
(5)
Only use this grid if you need to redraw your graph.

1.20: Surds and rationalisation

4PM1/2/June/2023 — Question 1 · 5 marks

Given that a+253−5=11+b52\frac{a + 2\sqrt{5}}{3 - \sqrt{5}} = \frac{11 + b\sqrt{5}}{2} where aa is an integer and bb is prime,
find the value of aa and the value of bb
Show your working clearly.
(5)

1.22: Simplify a surd expression

4PM1/1/June/2022 — Question 1 · 3 marks

Given that
23−433+5=a+b3,\frac{2\sqrt{3}-4}{3\sqrt{3}+5}=a+b\sqrt{3},
where aa and bb are integers, find, without using a calculator, the value of aa and the value of bb.
Show your working clearly.
(3)

1.23: Estimate roots using a graph

4PM1/1/June/2022 — Question 6 · 11 marks

(a) Complete the table of values for
y=1+3e−xy = 1 + 3\mathrm{e}^{-x}
giving your answers to 2 decimal places where appropriate.
xx000.250.250.50.5111.51.52233
yy3.343.342.822.821.671.671.151.15
(2)
(b) On the grid opposite, draw the graph of
y=1+3e−xfor0≤x≤3y = 1 + 3\mathrm{e}^{-x} \quad \text{for} \quad 0 \leq x \leq 3
(2)
(c) By drawing an appropriate straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation
x=e−xin the interval0≤x≤3x = \mathrm{e}^{-x} \quad \text{in the interval} \quad 0 \leq x \leq 3
(3)
(d) By drawing an appropriate straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation
ln (x−1)3=−3xin the interval0≤x≤3\mathrm{ln}\,(x-1)^3 = -3x \quad \text{in the interval} \quad 0 \leq x \leq 3
(4)

1.24: Logarithmic graph and equations

4PM1/1R/June/2022 — Question 7 · 11 marks

A curve CC has equation
y=log10(x+2).y=\mathrm{log}_{10}(x+2).
(a) Using the axes below, sketch the graph of CC. Label the coordinates of the points of intersection of CC with the coordinate axes.
(2)
(b) Solve the equation
2(loga4+loga16)=1.2\left(\mathrm{log}_a4+\mathrm{log}_a16\right)=1.
(3)
(c) Solve the equation
5logq16+4log2q=24.5\mathrm{log}_q16+4\mathrm{log}_2q=24.
(6)

1.26: Estimate roots using a graph

4PM1/2R/June/2022 — Question 5 · 7 marks

(a) Complete the table of values for
y=e3x−2y = \mathrm{e}^{3x-2}
giving your answers to 2 decimal places.
xx000.250.250.50.50.750.7511
yy0.140.142.722.72
(2)
(b) On the grid opposite, draw the graph of
y=e3x−2for0≤x≤1y = \mathrm{e}^{3x-2} \quad \text{for} \quad 0 \leq x \leq 1
(2)
(c) By drawing a suitable straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation
3x=2+ln (3−x)3x = 2 + \mathrm{ln}\,(3-x)
(3)

1.28: Logarithmic equations

4PM1/1/June/2021 — Question 8 · 8 marks

Given that nn satisfies the equation
logan=loga3+loga(2n−1),\mathrm{log}_a n=\mathrm{log}_a3+\mathrm{log}_a(2n-1),
(a) find the value of nn.
(3)
Given that
logpx=3andlogpy−3logp2=4,\mathrm{log}_p x=3 \qquad \text{and} \qquad \mathrm{log}_p y-3\mathrm{log}_p2=4,
(b) (i) express xx in terms of pp,
(1)
(ii) express xyxy in terms of pp.
(4)

1.29: Estimate roots using a graph

4PM1/2/June/2021 — Question 7 · 9 marks

(a) Complete the table of values for
y=3x4+2y = 3^{\frac{x}{4}} + 2
Give your answers to 2 decimal places where appropriate.
xx001122334455
yy333.323.325.955.95
(2)
(b) On the grid opposite, draw the graph of
y=3x4+2for0≤x≤5y = 3^{\frac{x}{4}} + 2 \quad \text{for} \quad 0 \leq x \leq 5
(2)
(c) By drawing a suitable straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation
log3(6−2x)4−x=0\mathrm{log}_{3}(6-2x)^4 - x = 0
in the interval 0≤x≤50 \leq x \leq 5.
(5)

1.32: Logarithmic equations

4PM1/2/November/2020 — Question 4 · 7 marks

(i) Solve the equation
16logr4=log4r.16\mathrm{log}_r4=\mathrm{log}_4r.
(2)
(ii) Solve the equation
log59+log512+log515+log518=1+log5x+log5x2.\mathrm{log}_59+\mathrm{log}_512+\mathrm{log}_515+\mathrm{log}_518 =1+\mathrm{log}_5x+\mathrm{log}_5x^2.
(5)

1.34: Estimate roots using a graph

4PM1/2R/November/2020 — Question 4 · 11 marks

(a) Complete the table of values for
y=2x+1+2x2y = 2x + 1 + \frac{2}{x^2}
Give your answers to 2 decimal places where appropriate.
xx0.50.5111.51.5222.52.5333.53.5
yy556.326.328.168.16
(2)
(b) On the grid opposite, draw the graph of
y=2x+1+2x2for0.5≤x≤3.5y = 2x + 1 + \frac{2}{x^2} \quad \text{for} \quad 0.5 \leq x \leq 3.5
(2)
(c) Use your graph to obtain estimates, to 1 decimal place, of the roots of the equation
2x+2x2=7in the interval0.5≤x≤3.52x + \frac{2}{x^2} = 7 \quad \text{in the interval} \quad 0.5 \leq x \leq 3.5
(2)
(d) By drawing a suitable straight line on the grid, obtain estimates, to 1 decimal place, of the roots of the equation
3x2+2x2=5in the interval0.5≤x≤3.5\frac{3x}{2} + \frac{2}{x^2} = 5 \quad \text{in the interval} \quad 0.5 \leq x \leq 3.5
(5)

1.36: Simplify a surd fraction

4PM1/1/June/2019 — Question 2 · 3 marks

Given that 4+235−23\dfrac{4+2\sqrt{3}}{5-2\sqrt{3}} can be written in the form a+b3c\dfrac{a+b\sqrt{3}}{c} where aa and bb are integers and cc is prime, find the value of aa, the value of bb and the value of cc.
Show your working clearly.
(3)

1.37: Quadratic in disguise: exponential equations

4PM1/1/June/2019 — Question 8 · 10 marks

(a) Solve 5p2−9p+4=05p^{2}-9p+4=0.
(2)
(b) Hence solve
52x+1−9(5x)+4=05^{2x+1}-9(5^{x})+4=0
Give your answers to 3 significant figures where appropriate.
(4)
The curve with equation y=52x+1+5xy=5^{2x+1}+5^{x} intersects the curve with equation y=2(5x+1)−4y=2(5^{x+1})-4 at two points.
(c) Find the coordinates of each of these two points. Give your answers to 3 significant figures where appropriate.
(4)

1.38: Logarithmic equations with unknown base

4PM1/1/June/2019 — Question 9 · 12 marks

(a) Solve the equation
2log⁡p9+3log⁡3p=82\log_{p}9+3\log_{3}p=8
(6)
Given that log⁡23=log⁡43k\log_{2}3=\log_{4}3^{k}
(b) find the value of kk.
(2)
(c) Show that
6xlog⁡4x−3xlog⁡23−5log⁡4x+10log⁡23=log⁡4(x6x−536x−20)6x\log_{4}x-3x\log_{2}3-5\log_{4}x+10\log_{2}3=\log_{4}\left(\frac{x^{6x-5}}{3^{6x-20}}\right)
(4)

1.39: Surds and rationalisation and logarithmic equations

4PM1/1R/June/2019 — Question 3 · 7 marks

(a) Write down the value of log⁡39\log_{3}9.
(1)
(b) Solve the equation
log⁡39t=log⁡9(12t)2+2where t>0.\log_{3}9t=\log_{9}\left(\frac{12}{t}\right)^{2}+2\qquad\text{where }t>0.
Give your answer in the form aba\sqrt{b} where aa and bb are prime numbers.
(6)

1.40: Graph of a logarithmic function and root estimation

4PM1/1R/June/2019 — Question 8 · 11 marks

(a) Complete the table of values for y=2+ln⁡(2x+1)y=2+\ln(2x+1) giving your answers to 2 decimal places.
xx000.250.250.50.5111.51.52233
yy223.103.103.393.393.613.61
(2)
(b) On the grid opposite, draw the graph of y=2+ln⁡(2x+1)y=2+\ln(2x+1) for 0⩽x⩽30\leqslant x\leqslant 3.
(2)
(c) By drawing an appropriate straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation ln⁡(2x+1)=3x−4\ln(2x+1)=3x-4 in the interval 0⩽x⩽30\leqslant x\leqslant 3.
(3)
(d) By drawing an appropriate straight line on the grid, obtain an estimate, to one decimal place, of the root of the equation e(6−x)−(2x+1)2=0\mathrm{e}^{(6-x)}-(2x+1)^{2}=0 in the interval 0⩽x⩽30\leqslant x\leqslant 3.
(4)

1.42: Log graph and graphical roots

4PM1/2/January/2019 — Question 7 · 12 marks

(a) Complete the table of values for y=ln⁡(3x+1)+2y=\ln(3x+1)+2, giving your answers to 2 decimal places.
xx00112233445566
yy223.953.954.304.304.944.94
(2)
(b) On the grid opposite, draw the graph of y=ln⁡(3x+1)+2y=\ln(3x+1)+2 for 0⩽x⩽60\leqslant x\leqslant 6.
(2)
(c) Use your graph to obtain an estimate, to 1 decimal place, for the value of ln⁡10.6\ln 10.6.
You must show clearly how you have used your graph.
(3)
(d) By drawing a straight line on the grid, obtain estimates, to 1 decimal place, for the roots of the equation (3x+1)2=e(x+1)(3x+1)^{2}=\mathrm{e}^{(x+1)} in the interval 0⩽x⩽60\leqslant x\leqslant 6.
(5)

1.47: Estimate roots using a graph

4PM1/1/January/2018 — Question 5 · 9 marks

1.47 diagram 1
(a) Complete the table of values for y=x3+2x+1y=\dfrac{x^3+2}{x+1} giving your answers to 2 decimal places where appropriate.
xx00.511.5234
yy1.422.157.25
(2)
(b) On the grid opposite draw the graph of y=x3+2x+1y=\dfrac{x^3+2}{x+1} for 0≤x≤40\le x\le4. (2)
(c) By drawing a suitable straight line on your graph obtain an estimate, to 1 decimal place, of the root of the equation x3+x2−3x−2=0x^3+x^2-3x-2=0 in the interval 0≤x≤40\le x\le4. (5)

1.49: Logarithmic equations and exponential equations

4PM1/2/June/2018 — Question 4 · 9 marks

(a) Find the exact value of the root of the equation e3x=8e^{3x}=8.
Give your answer in the form ln⁡a\ln a, where aa is an integer. (2)
The curve C1C_1 has equation y=2e3xy=2e^{3x} and the curve C2C_2 has equation y=(e3x−4)2y=(e^{3x}-4)^2.
The curves C1C_1 and C2C_2 intersect at the points PP and QQ.
(b) Use algebra to find the exact coordinates of the points PP and QQ. (5)
(c) Find, to 3 decimal places, the length of PQPQ. (2)

1.43: Estimate roots using a graph

4PM1/1/January/2017 — Question 7 · 11 marks

1.43 diagram 1
(a) Complete the table of values for y=ln⁡(5x+1)+2y=\ln(5x+1)+2 giving your answers to 2 decimal places.
xx01234567
yy24.404.775.045.43
(2)
(b) On the grid opposite draw the graph of y=ln⁡(5x+1)+2y=\ln(5x+1)+2 for 0≤x≤70\le x\le7. (2)
(c) By drawing an appropriate straight line on the grid, obtain an estimate, to 1 decimal place, of the positive root of the equation ln⁡(5x+1)−x=0\ln(5x+1)-x=0 in the interval 0≤x≤70\le x\le7. (3)
(d) By drawing an appropriate straight line on the grid, obtain an estimate, to 1 decimal place, of the root of the equation e(3x−1)=5x+1e^{(3x-1)}=5x+1 in the interval 0≤x≤70\le x\le7. (4)

1.46: Logarithmic equations

4PM1/1/June/2017 — Question 7 · 13 marks

(a) Solve log⁡a1024=5\log_a1024=5. (1)
(b) Solve log⁡3(6c+9)=4\log_3(6c+9)=4. (2)
(c) Solve 2(log⁡b25+log⁡b125)=52(\log_b25+\log_b125)=5. (4)
(d) Solve the equations, giving the values of xx and yy to 3 significant figures,
3log⁡2x+4log⁡3y=103\log_2x+4\log_3y=10
log⁡2x−2log⁡3y=1\log_2x-2\log_3y=1
(6)

1.44: Logarithmic equations

4PM1/2/January/2017 — Question 7 · 11 marks

(a) Given that kk is a constant such that
27(x+2)−3(3x+5)3x×9(x+2)=k\frac{27^{(x+2)}-3^{(3x+5)}}{3^x\times9^{(x+2)}}=k
find the value of kk. (5)
(b) Find the exact roots of the equation 2log⁡2y+3log⁡y2=72\log_2y+3\log_y2=7. (6)

1.52: Logarithmic equations

4PM1/1/January/2016 — Question 10 · 11 marks

Given that 2log⁡yx+2log⁡xy=52\log_y x+2\log_x y=5
(a) show that log⁡yx=12\log_y x=\dfrac12 or log⁡yx=2\log_y x=2. (5)
(b) Hence, or otherwise, solve the equations
xy=27xy=27
2log⁡yx+2log⁡xy=52\log_y x+2\log_x y=5
(6)

1.55: Logarithmic equations

4PM1/1/June/2016 — Question 6 · 12 marks

Solve
(a) log⁡x1024=5\log_x1024=5 (2)
(b) log⁡3(7y−3)=4\log_3(7y-3)=4 (2)
(c) log⁡a25+2log⁡a625=10\log_a25+2\log_a625=10 (3)
(d) log⁡b7−2log⁡7b+1=0\log_b7-2\log_7b+1=0 (5)

1.56: Estimate roots using a graph

4PM1/1/June/2016 — Question 7 · 11 marks

1.56 diagram 1
(a) Complete the table of values for y=2x−4y=2^x-4, giving your answers to 2 decimal places.
xx00.511.522.52.753
yy-3-202.734
(2)
(b) On the grid opposite, draw the graph of y=2x−4y=2^x-4 for 0≤x≤30\le x\le3. (2)
(c) Use your graph to obtain an estimate, to one decimal place, of the value of log⁡27\log_2 7. Show clearly how you used the graph. (3)
(d) By drawing a straight line on your graph, obtain an estimate to one decimal place of the root of the equation 2x+3x=72^x+3x=7 in the interval 0≤x≤30\le x\le3. (4)

1.54: Logarithmic equations, exponential equations and graphical solution

4PM1/2/January/2016 — Question 11 · 11 marks

1.54 diagram 1
(a) Complete the table of values for y=ex−1+2y=e^{x-1}+2. Give your answers to 2 decimal places where appropriate.
xx-2-10123
f(x)f(x)2.054.729.39
(2)
(b) On the grid opposite, draw the graph of y=ex−1+2y=e^{x-1}+2 for −2≤x≤3-2\le x\le3. (2)
(c) Use your graph to obtain an estimate, to 1 decimal place, of the root of the equation 4=ex−14=e^{x-1} in the interval −2≤x≤3-2\le x\le3. (2)
(d) By drawing a straight line on the grid, obtain an estimate, to 1 decimal place, of the root of the equation ln⁡(4x−4)=x−1\ln(4x-4)=x-1 in the interval −2≤x≤3-2\le x\le3. (5)

1.50: Surds, indices and logarithms

4PM1/1/January/2015 — Question 6 · 12 marks

(a) Solve, giving your answer to 3 significant figures,
3z−4=03^z-4=0
(3)
Solve the following equations, giving your answers to 3 significant figures where appropriate.
(b) 9y−13(3y)+36=09^y-13(3^y)+36=0 (4)
(c) 6x−4(2x)−3x+4=06^x-4(2^x)-3^x+4=0 (5)

1.51: Logarithmic equations

4PM1/2/June/2015 — Question 10 · 11 marks

(a) Find the value of log⁡39\log_3 9. (1)
Given that log⁡94=klog⁡34\log_9 4=k\log_3 4,
(b) find the value of kk. (2)
(c) Show that
2xlog⁡3x−3log⁡3x−4xlog⁡94+6log⁡94=log⁡3(x4)2x−32x\log_3x-3\log_3x-4x\log_9 4+6\log_9 4=\log_3\left(\dfrac{x}{4}\right)^{2x-3}
(5)
(d) Hence solve the equation 2xlog⁡3x−3log⁡3x−4xlog⁡94+6log⁡94=02x\log_3x-3\log_3x-4x\log_9 4+6\log_9 4=0. (3)