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Question
Factorise : x2 - (a - 3)x - 3a
Sum
Solution
x2 - (a - 3)x - 3a
= x2 - ax + 3x - 3a
= x (x - a) + 3 (x - a)
= (x - a) (x + 3)
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Factorisation by Grouping
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