Question
If (a + b) = 7 and ab = 9, then find the value of
(a2Â + b2).Solution
According to the question, (a + b)2Â = 72 Or, a2Â + b2Â + 2ab = 49 Or, a2Â + b2Â + 18 = 49 So, a2Â + b2Â = 49 - 18 = 31
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