1.

Factorise 3xraise to the power 2 -x-4

Answer» 3X^2-x-4
= 3x^2-(4-3)x-4
= 3x^2-4x+3x-4
= 3x^2+3x-4x-4
= 3x(x+1)-4(x+1)
= (3x-4) (x+1)


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