Mathematics
Factorise :
x2 - y2 - 2x + 2y
Factorisation
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Answer
x2 - y2 - 2x + 2y
Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= (x2 - y2) - (2x - 2y)
= (x - y)(x + y) - 2(x - y)
= (x - y)((x + y) - 2)
= (x - y)(x + y - 2)
Hence,x2 - y2 - 2x + 2y = (x - y)(x + y - 2)
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