JEE Main · 2026 · 06 Apr 2026 · Shift 1 · Quadratic Equations and Inequalities

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Let one root of the quadratic equation in x:

be twice the other. Then the length of the latus rectum of the parabola is equal to:
  1. (A)4
  2. (B)6
  3. (C)8
  4. (D)12✓ Correct

Answer: (D)

Solution

Let the roots be and . Then and . Since , we get , which reduces to , i.e. , so . The equation is then with roots in ratio , and has latus rectum of length .

JEE Main · 2026 · 06 Apr 2026 · Shift 1 · Single correct option

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