Question
Factorise:
x2 + y2 - z2 - 2xy
x2 + y2 - z2 - 2xy
✓
Answer
x2 + y2 - z2 - 2xy
= (x2 + y2 - 2xy) - z2
= (x - y)2 - z2
= (x - y - z)(x - y + z)
= (x2 + y2 - 2xy) - z2
= (x - y)2 - z2
= (x - y - z)(x - y + z)
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