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RRB Junior Engineer / DMS / CMA 2019 · Question 71 of 3719

If x =7+4√3. then find the value of x +1/ x

Mathematics - Algebra

  1. Aa. 14Correct
  2. Bb. 8√3
  3. Cc. 14+8√3
  4. Dd. 3√3

Answer: A. a. 14

Explanation

x = 7 + 4√ 3 1/x = 7- 4√ 3 x + 1/x = 7 + 4√ 3 +7-4√ 3 = 14 The value of x + 1/x is 14.

Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-2) — ixambee compilation with answer key and solutions · reliable-secondary

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