Question

i'm new to taking derivatives with the product rule and need help step by step

Answer 1

\[f(x)=xe^{-9x}\]

Answer 2

I need to find f' f'' and f'''

Answer 3

f'= \[x*e^{-9x}-9*x*e^{-9x}= (1-9x)e^{-9x}\]

Answer 4

i get that much... i get really confused taking another derivative at this point