ibps-rrb-os1 2017 · Question 54 of 74

I. 2x2 + 15x + 28 = 0 II. 2y2 + 13y + 21=0

Quantitative Aptitude (misc)

Aif x>y
Bif x≥y
Cif x<y
Dif x ≤yCorrect
Eif x = y or no relationship can be established.

Answer: D. if x ≤y

Explanation

I. 2𝑥2 + 15𝑥 + 28 = 0 2𝑥2 + 8𝑥 + 7𝑥 + 28 = 0 2𝑥(𝑥 + 4) + 7(𝑥 + 4) = 0 (2𝑥 + 7)(𝑥 + 4) = 0 𝑥 = (− 7 2 ) , −4 II. 2𝑦2 + 13𝑦 + 21 = 0 2𝑦2 + 7𝑦 + 6𝑦 + 21 = 0 𝑦(2𝑦 + 7) + 3(2𝑦 + 7) = 0 (𝑦 + 3)(2𝑦 + 7) = 0 𝑦 = −3, −7 2 𝑥 ≤ 𝑦

Source: IBPS RRB PO Prelims 2017 Memory Based Paper (Adda247) · memory-based

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