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Railways PYQCBT 1 2016

RRB NTPC · Question 84

Find the factors of (x^2 + x - 20). A. (x + 5) (x - 4) B. (x + 4) (x - 5) C. (x - 2) (x + 10) D. (x - 2) (x + 5)

  1. B

  2. A

  3. D

  4. C

Show answer & explanation

Answer: (B) A

Explanation

Two numbers with product −20 and sum +1 are 5 and −4. So x² + x − 20 = (x + 5)(x − 4).