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Question
factorise: x2 - 2xy + y2 - z2
Sum
Solution
x2 - 2xy + y2 - z2
= (x2 - 2xy + y2) - z2
= (x - y)2 - (z)2
= (x - y - z)(x - y + z)
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Factorisation of Trinomials
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