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Question
Expand : (a+b−c)2
Sum
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Solution
(a+b−c)2 = (a)2 + (b)2 +(−c)2 + 2 × a × b + 2 × b × (−c) + 2 × (−c) × (a)
= a2 + b2 + c2 + 2ab − 2bc − 2ca
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Important Formula of Expansion
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