If (a+b)^2=25, and a^2+b^2=17, then what is a*b equal to? Thanks.

asked Mar 27, 2018 99.9k views

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4 votes

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

substituting:-

17 = 25 - 2 a*b
a*b = (25-17) / 2 = 8/2 = 4 answer

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