2 Factorise
(a2 - ab - 3a. 34
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(i) a2 – ab – 3a + 3b = a (a – b) – 3(a – b). = (a – b) (a – 3). (ii) x2y – xy2 + 5x – 5y = xy (x – y) + 5 (x – y). = (x – y) (xy + 5).
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