# Math Help - Second Derivative

1. ## Second Derivative

Ok, I can't get the right answer of $96e^{4x^4}x^2(16x^4+3)$

Here is my work

$f(x)=6e^{4x^4}$

$f'(x)=6e^{4x^4}(16x)$

$=96xe^{4x^4}$

$f''(x)=96xe^{4x^4}(16x)+e^{4x^4}(96)$

$=1536x^2e^{4x^4}+96e^{4x^4}$

Where am I going wrong??

2. the derivative of $4x^4$ is $16x^3$, not $16x$

3. in your first deriviative it should be (16*x^3) instead of (16*x)