factorise 7 - 12 x - 4x^ 2
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Standard form is
-4x²-12x+7
=-4x²-14x+2x+7
=-2x(2x+7)+1(2x+7)
=(2x+7)(-2x+1)
-4x²-12x+7
=-4x²-14x+2x+7
=-2x(2x+7)+1(2x+7)
=(2x+7)(-2x+1)
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