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14-01-2022 Simplification

Q. If a - b = 3 and a^2 + b^2 = 29, find the value of ab.

A. 10
B. 12
C. 15
D. 18


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Dapzoi Verified
Commented on 2022-01-14 13:26:57 (IST)
Answer: Option A


Explanation:

2ab = (a^2 + b^2) - (a - b)^2

= 29 - 9 = 20

ab = 10.