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SSC CHSL 2023 · PYQ · Algebra · medium

If x + 1/x = 7, then the value of x² + 1/x² is:

  1. A.47✓ Correct
  2. B.51
  3. C.5
  4. D.49

Explanation

Using the identity (x + 1/x)² = x² + 2 + 1/x², we get 49 = x² + 1/x² + 2, so x² + 1/x² = 47.
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