## Precalculus (6th Edition) Blitzer

Step 1. We can identify the domain and range as: Domain $x\in[-1,1]$, Range $y\in[-2,0]$ Step 2. The equation can be rewritten as $y^2=4-4x^2$ or $\frac{x^2}{1}+\frac{y^2}{4}=1$ Step 3. We can graph the semiellipse as shown in the figure.