1)Виет
5x²+14x-3=0
x²+2.8x-0.6=0
x1+x2=(-2.8) -3+0.2=-2.8 x1=(-3)
x1×x2=(-0.6) -3×0.2=-0.6 x2=0.2
2)дискриминант
D=14²-4×(-3)×5=196+60=256
x1=-14+16/10=1/5=0.2
x2=-14-16/10=(-3)
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Answers & Comments
1)Виет
5x²+14x-3=0
x²+2.8x-0.6=0
x1+x2=(-2.8) -3+0.2=-2.8 x1=(-3)
x1×x2=(-0.6) -3×0.2=-0.6 x2=0.2
2)дискриминант
5x²+14x-3=0
D=14²-4×(-3)×5=196+60=256
x1=-14+16/10=1/5=0.2
x2=-14-16/10=(-3)