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OpenStudy (anonymous):
SAT question: If (a+b)^2 = 64 and a^2+b^2 = 40, what is the value of 4ab?
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OpenStudy (anonymous):
\[(a+b)^2=a^2+b^2+2ab=64\] and \[a^2+b^2=40\] can work it out now right?
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