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Question
Factorise : a2 - b2 - (a + b) 2
Sum
Solution
a2 - b2 - (a + b) 2
= a2 - b2 - ( a2 + 2ab + b2 )
= a2 - b2 - a2 - 2ab - b2
= - 2ab - 2b2
= - 2b( a + b )
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Method of Factorisation : Difference of Two Squares
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