F(x)=3x²+8x+2
F(x)=(3x²+8x+2)⁾=6x+8
F(x)=0
6x+8=0
6x=-8
x=-8/6=- 4/3
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f(x)=3/2x²+4x-1
F(x)=3x+4
F(x)=0
3x+4=0
3x=- 4
x= -4/3
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f(x)=2x²+3x
F(x)=4x+3
F(x)=0
4x+3=0
4x=-3
x= -3/4