Question:

The points of contact Q and R of tangent from the point P (2, 3) on the parabola y<span class="math-inline">^2</span> = 4x are

9, 6 and 1, 2

1, 2 and 4, 4

4, 4 and 9, 6

9, 6 and 1/4, 1

Step-by-Step Solution

Key Concept: General

a² + 6ab - 7b² ≥ 0

Correct Answer: a² + 6ab - 7b² ≥ 0