Find f(x) for:
a) F(x)= (8-x^4) all divided by x
Either write it as $\displaystyle \frac{8- x^4}{x}$ and use the quotient rule, or write it as $\displaystyle (8- x^4)x^{-1}$ and use the product rule or divide it out to get $\displaystyle 8x^{-1}- x^3$.
Do you know the derivative of $\displaystyle x^n$?