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Question
Factorise completely: x2 - y2 - 3x - 3y
Sum
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Solution
x2 - y2 - 3x - 3y = (x2 - y2) - 3 (x + y)
= (x + y) (x - y) - 3(x + y)
= (x + y)(x - y -3)
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Factorising Completely
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