Factorise
15(5x + 4)2_10(5x - 4)
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= 5 (5x – 4) [3 (25x2 – 40x + 16) – 2]
= 5 (5x – 4) (75x2 – 120x + 46)
(ii) 3a2 x – bx + 3a2 – b
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kisi ko puch ke batata hu
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