Thank You bobak (this is last one) tryed to multiply but didnt get right answer.
Find derivative using product rule
f(b) = (b^2 - 4b + 2)(2[b]^3 - b^2 + 4)
First, recall the product rule:
Let , where:
and
From this, you should be able to get your answer. To check your work, simply multiply out the original equation and find the derivative using the power rule.