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Sum
factorise : a2 - ab (1 - b) - b3
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Solution
a2 - ab (1 - b) - b3 = a2 - ab + ab2 - b3
= a(a - b) + b2 (a - b)
= (a - b) (a + b)2
Concept: Factorisation by Taking Out Common Factors
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