Question:
Find the equation of the hyperbola satisfying the give conditions: Vertices $(0, \pm 5)$, foci $(0, \pm 8)$
Solution:
Vertices $(0, \pm 5)$, foci $(0, \pm 8)$
Here, the vertices are on the $y$-axis.
Therefore, the equation of the hyperbola is of the form $\frac{y^{2}}{a^{2}}-\frac{x^{2}}{b^{2}}=1$.
Since the vertices are $(0, \pm 5), a=5$.
Since the foci are $(0, \pm 8), c=8$.
We know that $a^{2}+b^{2}=c^{2}$.
$\therefore 5^{2}+b^{2}=8^{2}$
$b^{2}=64-25=39$
Thus, the equation of the hyperbola is $\frac{y^{2}}{25}-\frac{x^{2}}{39}=1$.
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