# Equation of a hyperbola from features

Given some features of a hyperbola, find its equation.
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### Problem

A hyperbola centered at the origin has vertices at left parenthesis, plus minus, square root of, 7, end square root, comma, 0, right parenthesis, and foci at left parenthesis, plus minus, square root of, 27, end square root, comma, 0, right parenthesis.
Write the equation of this hyperbola.