Hi,

I am trying to differentiate $\displaystyle e^{-3x}$.

I don't understand why this is the correct answer: $\displaystyle -3e^{-3x}$

Shouldn't the answer be this: $\displaystyle -3e^{-3x-1}$ ?

My understanding of differentiation is that if $\displaystyle y = ax^b$, then $\displaystyle y' = b \cdot ax^{b-1}$