# Chapter 9 - Mid-Chapter Check Point - Page 1000: 4

See graph and explanations.

#### Work Step by Step

Step 1. Graph the equation as shown in the figure. Step 2. We can identify from the given equation that $a=5, b=4$; thus $c=\sqrt {5^2-4^2}=3$ Step 3. As the center of the ellipse is at $(-2,1)$ and the major axis is horizontal, the foci are $(-5,1)$ and $(1,1)$ as shown in the figure. See graph and explanations.

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