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Railways PYQCBT 1 2016

RRB NTPC · Question 92

If (x^2 + 1/16x^2) = 19/2, then find the value of (2x – 1/2x). A. 6 B. 12 C. 32 D. 41

  1. B

  2. A

  3. C

  4. D

Show answer & explanation

Answer: (B) A

Explanation

(2x − 1/(2x))² = 4x² + 1/(4x²) − 2 = 4(x² + 1/(16x²)) − 2 = 4 × 19/2 − 2 = 36, so 2x − 1/(2x) = 6.