W(x)=x³+3x²-4x-12=x²(x+3)-4(x+3)=(x²-4)(x+3)=(x-2)(x+2)(x+3)
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W(x)=x³+3x²-4x-12=x²(x+3)-4(x+3)=(x²-4)(x+3)=(x-2)(x+2)(x+3)
W(x)=x²(x+3)-4(x+3)
W(x)=(x+3)(x²-4)
W(x)=(x+3)(x-2)(x+2)
odp.:
x=-3
x=2
x=-2
x²(x-3)-4(x-3)=0
(x²-4)(x-3)=0
(x-2)(x+2)(x-3)=0
x-2=0
x=-2
x+2=0
x=2
x-3=0
x=3