SSC CHSL 2023 · PYQ · Algebra · medium
If x + 1/x = 7, then the value of x² + 1/x² is:
Answer
The correct answer is A: 47. Using the identity (x + 1/x)² = x² + 2 + 1/x², we get 49 = x² + 1/x² + 2, so x² + 1/x² = 47.
- A.47✓ Correct
- B.51
- C.5
- D.49
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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