Question
Factorise:
$x^2-x y+y-x$
$x^2-x y+y-x$
✓
Answer
$x^2-x y+y-x$
$=x(x-y)-1(x-y)$
$=(x-y)(x-1)$
$=x(x-y)-1(x-y)$
$=(x-y)(x-1)$
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