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Question
Factorise: x2 - y2 - 2yz - z2
Sum
Solution
x2 - y2 - 2yz - z2
= x2 - (y2 + 2yz + z2)
= x2 - (y + z)2
= (x + y + z) {x - (y + z)}
= (x + y + z) (x - y - z)
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Factorisation of Trinomials
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