ibps-rrb-oa 2022 · Question 49 of 181

If y² – x² = 72 and y – x = 4, then find the value of (x × y)?

Algebra

Aa) 33
Bb) 44
Cc) 55
Dd) 77Correct
Ee) 66

Answer: D. d) 77

Explanation

y2 – x2 = 72 ------ (i) y – x = 4 --------- (ii) we know a2 – b2= (a + b) (a – b) So, 4 (y + x) = 72 y + x = 18 ------------ (iii) from (ii) & (iii) we get – y = 11 & x = 7 so, (x × y) = 11 × 7 =

Source: IBPS RRB Clerk Prelims 2022 Memory Based Paper (Adda247) · memory-based

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