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UP TGT Mathematics Co-ordinate Geometry Test Series - Part 3

If the chord of contact of tangents from (x₁, y₁) to y² = 4ax subtends a right angle at the vertex, then x₁ is equal to:

Type: MCQ • Marks: 1
If the chord of contact of tangents from (x₁, y₁) to y² = 4ax subtends a right angle at the vertex, then x₁ is equal to:
Options
A. -a
B. -2a
C. -3a
D. -4a
Explanation
Condition for chord of contact of parabola to subtend right angle at vertex is x₁ = -3a.
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