If a-b = 7 and ab = 9, then a^2 + b^2 = ?
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a-b=7
ab=9
a^2 +b^2 = (a-b) ^2 +2ab
Or, a^2 +b^2 =7^2 +2(9) [putting the value]
Or, a^2 +b^2 =49+18
So a^2 +b^2 =67
ab=9
a^2 +b^2 = (a-b) ^2 +2ab
Or, a^2 +b^2 =7^2 +2(9) [putting the value]
Or, a^2 +b^2 =49+18
So a^2 +b^2 =67
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