# Math Help - Find the first and second derivatives of the following function.

1. ## Find the first and second derivatives of the following function.

f (x) = 9x^4-8x^3+9x

f ' (x) =

f '' (x) =

2. $\
\begin{array}{l}
f(x) = 9x^4 - 8x^3 + 9x \\
f'(x) = 36x^3 - 24x^2 + 9 \\
f''(x) = 108x^2 - 48x \\
\end{array}
\$

3. would you show me how u arrived at these answers please

4. Originally Posted by plstevens
If $y = ax^n\,$ then $\frac{dy}{dx} = n a x^{n-1}$.