if a+b=25, then a square + b square = 225. find the value of ab
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(a+b)²= a²+b²+2ab
a+b=25;a² + b²=225 ab=?
(25)²=225+2ab
625=225 + 2ab
625 - 225 = 2ab
400=2ab
400/2 = ab
therefore ab=200
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