For the parabola

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

Problem

For the parabola x2=16yx^{2}=16y, the equation of its directrix is (a) y=4y=4 (b) x=4x=4 (c) y=−4y=-4 (d) y=−16y=-16

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