1.6: Past-paper question 3

4PM1/1/November/2023 — Question 3 · 8 marks

g(x)=mx210x37wherem is an integerg'(x) = mx^2 - 10x - 37 \quad \mathrm{where} m \text{ is an integer}
The curve y=g(x)\displaystyle y = g(x) passes through the point with coordinates (1,20)\displaystyle (1, 20)
Given that (x5)\displaystyle (x-5) is a factor of g(x)\displaystyle g(x)
(a) show that g(x)=2x35x237x+60\displaystyle g(x) = 2x^3 - 5x^2 - 37x + 60
(5)
(b) Hence, or otherwise, use algebra to solve the equation g(x)=0\displaystyle g(x) = 0
(3)