factorise 84 subtraction 2 x-2 x square
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84 - 2x - 2x²
= - 2x² - 2x + 84
= - 2x² - 14x + 12x + 84
= - 2x(x + 7) + 12(x + 7)
= (x + 7)(12 - 2x)
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