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Question
If a2 + b2 = 41 and ab = 4, find : a + b
Sum
Solution
(a + b)2 = a2 + b2 + 2ab
= 41 + 2(4)
= 41 + 8
= 49
⇒ (a + b)2 = 49
∴ a + b = 7
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Important Formula of Expansion
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