f(x) for five values of x

With 2nd F ALGB, a whole table is quick to make. For $-1$, $\displaystyle f$ is $\displaystyle -2$. For $-0.5$, the value is $\displaystyle 1\frac{1}{8}$. For $0$, $\displaystyle f=2$. For $1$, $\displaystyle f=0$. And for $2$, $\displaystyle f=-2$. On the graph, these are 5 points of the curve.

▶ Watch this step in the video (1:13:22)