## College Algebra (6th Edition)

Foci: $(-1, -2)$ and $(7, -2)$.
Bring to stadard form (divide with 1$8$) $\displaystyle \frac{(x+3)^{2}}{18}+\frac{(y-2)^{2}}{2}=1$ $a^{2}=18,$ (main axis horizontal), $a=\sqrt{18}=3\sqrt{2}\approx 4.24$ $b^{2}=2$, $b=\sqrt{2}\approx 1.41$ Center: $(h,k)=(3,-2)$ $c^{2}=a^{2}-b^{2}=18-2-16,$ $c=4$ Foci are $c$ units right and $c$ units left of center. Foci: $(-1, -2)$ and $(7, -2)$.