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Sum
Factorise : - x2y - x + 3xy + 3
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Solution
- x2y - x + 3xy + 3
= 3 - x + 3xy - x2y
= 1(3 - x) + xy (3 - x)
= (3 - x) (1 + xy) = (xy + 1) (3 - x)
Concept: Factorisation by Grouping
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