Question
Factorise:
x2 - xy + y - x
x2 - xy + y - x
✓
Answer
x2 - xy + y - x
= x(x - y) - 1(x - y)
= (x - y)(x - 1)
= x(x - y) - 1(x - y)
= (x - y)(x - 1)
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