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