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Railways PYQCBT 1 2016

RRB NTPC · Question 90

Roots of the following equation are 6x2 + 4x - 2 = 0

  1. 1, -1 / 3

  2. 1 / 3, -1 / 3

  3. 1, 1 / 3

  4. -1, 1 / 3

Show answer & explanation

Answer: (D) -1, 1 / 3

Explanation

Divide by 2: 3x² + 2x − 1 = 0. Factorise: (3x − 1)(x + 1) = 0, so x = 1/3 or x = −1.