3 x square minus x minus 4 factorise 3 x square minus x minus 4 factorise
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3x²-x-4 = 3x² + 3x-4x - 4 (3*4=12 +3-4= -1)
= 3x(x+1) - 4(x+1)
= (3x-4)(x+1)
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