This question is asking me to find the gradient function, $y'$ of the equation $y=5e^{3x}-6e^{-6x}$
I thought it was as simple as having $y=15e^{3x} - 36e^{-6x}$, however this isn't the gradient function. What am I doing so horribly wrong?
(yes, I'm really new to calculus).
Thanks!