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Railways PYQCBT 1 2016

RRB NTPC · Question 60

If x - √x = 20; Find the value of √x. A. 5 B. 6 C. 8 D. 7

  1. D

  2. B

  3. C

  4. A

Show answer & explanation

Answer: (D) A

Explanation

Let √x = t, so t² − t − 20 = 0, i.e. (t − 5)(t + 4) = 0. A square root cannot be negative, so √x = 5 (x = 25).