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= a=2,b=-1,c=-3
=axc=2x(-3)=-6 kmudian kita lht faktor brp dri -6 yg bila dijumlahkan -1
=yaitu 2 dan -3
=maka (2x2+2x)-(3x-3)
=2x(x+1)-3(x+1)
=(2x-3)(x+1)