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Question
Factorise : a3 - a2 - ab + a + b - 1
Sum
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Solution
a3 - a2 - ab + a + b - 1
= a3 - a2 - ab + b + a - 1
= a2 (a - 1) - b (a - 1) + 1 (a - 1)
= (a - 1) (a2 - b + 1)
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Factorisation by Grouping
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