Question
Factorise:
$y^2-x y(1-x)-x^3$
$y^2-x y(1-x)-x^3$
✓
Answer
$=y^2-x y(1-x)-x^3$
$=y^2-x y+x^2 y-x^2$
$=y(y-x)+x^2(y-x)$
$=(y-x)\left(y+x^2\right)$
$=y^2-x y+x^2 y-x^2$
$=y(y-x)+x^2(y-x)$
$=(y-x)\left(y+x^2\right)$
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