Factorise the following:
y2 - xy(1 - x) - x3
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= y2 - xy + x2y - x3
= y(y - x) + x2(y - x)
= (y - x)(y + x2).
Hence, y2 - xy(1 - x) - x3 = (y - x)(y + x2).
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a(a - 2b - c) + 2bc
x2 + xy(1 + y) + y3
ab2 + (a - 1)b - 1
2a - 4b - xa + 2bx