3
QuizMultiple Choice

Equations of Hyperbolas (continued) — Quiz

Question 3 • Precalculus

The vertices of a hyperbola are located at open paren 3 comma negative 6 close paren and open paren 3 comma 6 close paren The foci of the same hyperbola are located at open paren 3 comma negative 10 close paren and open paren 3 comma 10 close paren What is the equation of the hyperbola?

Answer
A
the fraction with numerator y squared and denominator 64 minus the fraction with numerator open paren x minus 3 close paren squared and denominator 36 is equal to 1
B
the fraction with numerator open paren y minus 3 close paren squared and denominator 64 minus the fraction with numerator x squared and denominator 36 is equal to 1
C
the fraction with numerator open paren y minus 3 close paren squared and denominator 36 minus the fraction with numerator x squared and denominator 64 is equal to 1
D
the fraction with numerator y squared and denominator 36 minus the fraction with numerator open paren x minus 3 close paren squared and denominator 64 is equal to 1

Explanation

The center is the midpoint of the vertices, (3, 0), and the hyperbola opens up and down because the vertices share the same x-coordinate. The distance from the center to a vertex is a = 6, and the distance to a focus is c = 10, so b² = c² − a² = 100 − 36 = 64. Thus the equation is y²/36 − (x − 3)²/64 = 1, which is choice B.

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