If a - b = 3 and a^2 + b^2 = 31, find the value of ab.

If a - b = 3 and a^2 + b^2 = 31, find the value of ab.

Quiz

Answer/Solution

11

Steps/Work

2ab = (a^2 + b^2) - (a - b)^2
= 31 - 9 = 22
ab = 11.
Answer is D.

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