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RRB Junior Engineer / DMS / CMA 2019 · Question 24 of 3719

Five times a positive integer is 3 less than twice its square. Find the integer.

Mathematics - Number System

  1. Aa. 2
  2. Bb. 5
  3. Cc. 3Correct
  4. Dd. 8

Answer: C. c. 3

Explanation

Let the positive integer be x, then 5x + 3 = 2x2 2x2 5x-3=0 2x²-6x+x-3 = 0 2x (x-3) + 1(x - 3) = 0 (2x + 1) (x - 3) = 0 Taking, (x - 3) = 0 x=3 So, the positive integer is 3.

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

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