Question

Find the derivative of
f(x) = (ax^4 + b)^5
Assume that a and b are constants.

Answer 1

Use the chain rule

Answer 2

So you have 5(ax^4 + b)^4 (4ax^3)

Answer 3

That simplifies to: (20ax^3)(ax^4 + b)

Answer 4

Makes sense?