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Railways PYQCBT 1 2016

RRB NTPC · Question 57

If 40x^2 = 734^2 – 234^2, then find the value of x. A) 110 B) 121 C) 11 D) 144

  1. C

  2. D

  3. B

  4. A

Show answer & explanation

Answer: (D) A

Explanation

734² − 234² = (734 − 234)(734 + 234) = 500 × 968 = 4,84,000. So x² = 12,100 and x = 110.