3.15: Differentiate and integrate (3x+1) ln(3x+1)

0606/11/M/J/23 — Question 10 · 7 marks · Exponentials, Log laws

It is given that y=(3x+1)2ln(3x+1)y = (3x + 1)^{2}\ln(3x + 1).
(a)
Find dydx\dfrac{\mathrm{d}y}{\mathrm{d}x}.
[3]
(b)
Hence find (3x+1)ln(3x+1)dx\displaystyle\int(3x + 1)\ln(3x + 1)\,\mathrm{d}x.
[4]