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Question
Factorise : x2 - (b - 2)x - 2b
Sum
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Solution
x2 - (b - 2)x - 2b
= x2 - bx + 2x - 2b
= x (x - b) + 2(x - b)
= (x - b) (x + 2)
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Factorisation by Grouping
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