§1.3 The derivative of a function at a point

Introduction

Suppose that $f$ is the function given by the graph below and that $a$ and $a+h$ are the input values as labeled on the $x$-axis. Use the graph in Figure 1.3 to answer the following questions.

Locate and label the points $(a,f(a))$ and $(a+h, f(a+h))$ on the graph.