Factorise :
a3 - a2 - ab + a + b - 1
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= a3 - a2 - ab + b + a - 1
= a2(a - 1) - b(a - 1) + 1(a - 1)
= (a - 1)(a2 - b + 1)
Hence,a3 - a2 - ab + a + b - 1 = (a - 1)(a2 - b + 1)
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ab2 - (a - c) b - c
(a2 - b2) c + (b2 - c2)a
ab(c2 + d2) - a2cd - b2cd
2ab2 - aby + 2cby - cy2