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  9. Q35

ibps-rrb-os1 2019 · Question 35 of 186

I. 15x2 + 4x -35 = 0 II. 12y2 -7y -10 = 0

Quadratic Equations

  1. Aif x<y
  2. Bif x>y
  3. Cif x≥y
  4. Dif x≤y
  5. Eif x=y or the relation cannot be established.Correct

Answer: E. if x=y or the relation cannot be established.

Explanation

I. 15x2 + 4x -35 = 0 Pairs = 25, -21 And now dividing by a and by changing the sign we get, x = -1.6, 1.4 II. 12y2 -7y -10 = 0 Pairs = -15, 8 And now dividing by a and by changing the sign we get, y = 1.25, -0.6 Hence, relationship cannot be established between x and y. Alternate Method: If sign in constant value is -ve in both the quadratic equation, then relationship cannot be established between two roots.

Source: IBPS RRB PO (Scale 1) Officer 2019 Mains Previous Year Paper — Answer Key & Detailed Solutions (memory-based compilation, ixamBee) · memory-based

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