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  9. Q86

SSC CHSL 2023 · Question 86 of 92

If (x − x1 ) = 0.4 , and x > 0, what is the value of (x2 + x12 ) ? ​ ​

Algebra

  1. A4.46
  2. B3.32
  3. C1.84
  4. D2.16Correct

Answer: D. 2.16

Explanation

Given: x - 1/x = 0.4 Concept used: (a - b)2 = a2 - 2ab + b2 Calculation: Squaring both sides, ⇒ x2 - 2 + (1/x)2 = (0.4)2 ⇒ x2 + (1/x)2 = 0.16 + 2 ⇒ x2 + (1/x)2 = 2.16 The answer is 2.16

Source: SSC CHSL 2023 (Tier-I) Previous Year Paper (07-Aug-2023) (Shift 2) — prepp.in solved paper · reliable-secondary

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