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x(x - 7)
3x2 - 8x = x(3x - 8)
(x - 3)(2x - 7)
49 - x2 = -(x2 -49) = - (x-7)(x+7) divide by x -7 Answer: -(x+7) = -x-7
Factorise it: (x + 5)(3x - 8)