Question
If (a + b) = 7 and ab = 10, then find the value of (a
2 + b 2 ).Solution
According to the question,
(a + b) 2 = 7 2
Or, a 2 + b 2 + 2ab = 49
Or, a 2 + b 2 + 20 = 49
So, a 2 + b 2 = 49 - 20 = 29
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