JEE Main 2021 Mathematics question

A tangent and a normal are drawn at the point P(2, –4) on the parabola , which meet the directrix of the parabola at the points A and B respectively. If Q (a, b) is a point such that AQBP is a square, then 2a + b is equal to :

• (A)–16Correct
• (B)–18
• (C)–12
• (D)–20