factorise 12(x2 + 7x2)-8(x2 +7x)(2x-1)-15(2x-1)2
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12(2x+7x) -8(2x+7x) (2x-1) -15(2x-1) 2
(12-8) (2x+7x)(2x-1)-15(2x-1)2
4(2x+7x)-15×2(2x-1)
8x+14x-30(2x-1)
22x-60x+30
-38x+30
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