Factorise :

$(i) x (x + 3) + 5 (x + 3) (i i) 5 x (x - 4) - 7 (x - 4) (i i i) 2 m (1 - n) + 3 (1 - n)$

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Solution

$(i) x (x + 3) + 5 (x + 3) = (x + 3) (x + 5) (i i) 5 x (x - 4) - 7 (x - 4) = (x - 4) (5 x - 7) (i i i) 2 m (1 - n) + 3 (1 - n) = (1 - n) (2 m + 3) A n s .$

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