Let $f(x)=8-8x^2$

$($a$)$ For $h0,$ find the difference quotient $\frac{f(0+h)-f(0)}{h}.$ Simplify your answer so that the resulting expression is defined at $h=0.$

$\frac{f(0+h)-f(0)}{h}=$

$($b$)$ Find $f^{\text{'}}(0).$

$f^{\text{'}}(0)=$

$$