Factorise :

(i) 12x+15 (ii) 14m-21 (iii) 9n- $12 n^{2}$

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Solution

$(i) 12 x + 15 = 3 (4 x + 5) {H C F o f 12 a n d 15 = 3} (i i) 14 m - 21 = 7 (2 m - 3) {H C F o f 14 a n d 21 = 7} (i i i) 9 n - 12 n^{2} = 3 n (3 - 4 n) A n s . {H C F o f 9 a n d 12 = 3}$

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