The equation of a parabola is

MATHEMATICS · Single correct · AP · AP Precalculus · Functions with Parameters, Vectors, and Matrices · Functions with Parameters, Vectors, and Matrices

Problem

The equation of a parabola is y2=−9xy^2 = -9x. Where is its focus located? (a) (−92, 0)\left(-\dfrac{9}{2},\,0\right) (b) (94, 0)\left(\dfrac{9}{4},\,0\right) (c) (−94, 0)\left(-\dfrac{9}{4},\,0\right) (d) (0, 94)\left(0,\,\dfrac{9}{4}\right)

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