QUESTION $2$

Function Differentiation

Choose one $*10$ points

Calculate $\frac{d^{2}f}{d{x}^2}$ or $f^{\text{'}\text{'}}(x)$ if $f(x)=x^4+2x^3-7$

$($second order derivative$)$

$f^{\text{'}\text{'}}(x)=12x^2+4x$

$f^{\text{'}\text{'}}(x)=12x^2+12x$

$f^{\text{'}\text{'}}(x)=16x^3+18x^2$