f(x)=x^3(x^(4)-8)

Question

Find f '(x) by multiplying out before taking the derivative

Is the answer x^12+-8+x^12-8x^3

simplified to 2x^12-8x^3+-16

Answer 1

first, multiply it out..

f(x)=x^12 -8x^3
Now take the derivative. No way is it equal to what you have.