Chapter 2.1, Problem 76E

In Problems $\text{75-80}$, find and simplify each of the following, assuming $h\ne 0$ in $\left(\text{C}\right)$.

$\begin{array}{l}\left(\text{A}\right)f\left(x+h\right)\\ \left(\text{B}\right)f\left(x+h\right)-f\left(x\right)\\ \left(\text{C}\right)\frac{f\left(x+h\right)-f\left(x\right)}{h}\end{array}$

$f\left(x\right)=-3x+9$