f(x)=3x+x3,x>0f(x) = 3x + x^3, \quad x > 0f(x)=3x+x3,x>0.
a.
Differentiate to find f′(x)f'(x)f′(x).
[2]
b.
Given that f′(x)=15f'(x) = 15f′(x)=15, find the value of xxx.
[3]
Markscheme
Differentiation and Integration 1 Questions
19 exam-style questions on Edexcel A Level Old Maths Differentiation and Integration 1. Each one has a worked solution and a mark scheme showing where the marks go.