ibps-rrb-oa 2021 · Question 31 of 55

I. 20 = 3 + 4 𝑥² 𝑥 II. 32 + 1 = 12 𝑦² 𝑦

A(a) x > y
B(b) No relation can be established between x and y.
C(c) x ≤ y
D(d) x < yCorrect
E(e) x ≥ y

Answer: D. (d) x < y

Explanation

I. 20 4 = 3 + 𝑥² 𝑥 ⇒ 3x² + 4x – 20 = 0 ⇒ 3x² + 10x – 6x – 20 = 0 ⇒ x(3x +10) – 2 (3x + 10)= 0 ⇒ (x - 2) (3x + 10) = 0 −10 ⇒𝑥= 2, II. 32 12 + 1 = 𝑦² 𝑦 ⇒ y² – 12y + 32 = 0 ⇒ y² – 4y – 8y + 32 = 0 ⇒ y(y – 4) – 8 (y – 4) = 0 ⇒ (y – 8) (y - 4) = 0 ⇒ y = 8, 4 y > x

Source: IBPS RRB Clerk Mains Previous Year Paper 2021 (Questions) - BankersAdda · memory-based

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