W(x)= 8x^3-12x^2-20x+30
W(x)=4x^2(2x-3)-10(2x-3)
W(x)=(2x-3)(4x^2-10)
W(x)=(2x-3)(2x- pierwiastek z10)(2x+ pierwiastek z10)
grupowo robisz
4x^2(2x-3)-10(2x-3)
(2x-3)(4x^2-10)
2x-3=0 z tym drugim nawiasem to samo
2x=3/2
x=3
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W(x)= 8x^3-12x^2-20x+30
W(x)=4x^2(2x-3)-10(2x-3)
W(x)=(2x-3)(4x^2-10)
W(x)=(2x-3)(2x- pierwiastek z10)(2x+ pierwiastek z10)
grupowo robisz
4x^2(2x-3)-10(2x-3)
(2x-3)(4x^2-10)
2x-3=0 z tym drugim nawiasem to samo
2x=3/2
x=3