Factorise the following:
x2 + xy(1 + y) + y3
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= x2 + xy + xy2 + y3
= x(x + y) + y2(x + y)
= (x + y)(x + y2).
Hence, x2 + xy(1 + y) + y3 = (x + y)(x + y2).
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1 - a - b + ab
a(a - 2b - c) + 2bc
y2 - xy(1 - x) - x3
ab2 + (a - 1)b - 1