Factorise the following:
x3 - x2 - xy + x + y - 1
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Rearrange the above terms we get,
x3 - x2 - xy + y + x - 1
= x2(x - 1) - y(x - 1) + 1(x - 1)
= (x - 1)(x2 - y + 1).
Hence, x3 - x2 - xy + x + y - 1 = (x - 1)(x2 - y + 1).
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