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Railways PYQCBT 1 2016

RRB NTPC · Question 45

Factors of x^2 + 7x + 10 are A. (x –5)(x – 2) B. (x + 5)(x + 2) C. (x –5)(x + 2) D. (x –4)(x + 2)

  1. B

  2. C

  3. D

  4. A

Show answer & explanation

Answer: (A) B

Explanation

Two numbers with product 10 and sum 7 are 5 and 2. So x² + 7x + 10 = (x + 5)(x + 2).