If is a normal to the parabola

MATHEMATICS · Single correct · CBSE · Mathematics · Conic Sections · Conic Sections

Problem

If 2x+y+1−f=02x+y+\frac{1}{-f}=0 is a normal to the parabola y2=−8xy^2=-8x, then the value of 1−f\frac{1}{-f} is (1) −24-24 (2) −16-16 (3) −8-8 (4) 2424

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