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Question
Factorise completely: a2 + 2ab + b2 - c2
Sum
Solution
a2 + 2ab + b2 - c2 = (a2 + 2ab + b2) - c2
= (a + b)2 - (c)2
= (a + b+ c) (a + b - c)
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Factorising Completely
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