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valeriya345
@valeriya345
July 2022
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помогите плиииииииииз...
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wejde
Verified answer
1) 4x²+(-1x)+(-1)=0
4x²-x-1=0
D=(-1)²-4*4*(-1)=1+16=17
x₁=(1+√17)/8
x₂=(1-√17)/8
2) -x²/(1/8)=x
-x²=x/8
-x²-x/8=0
x²+x/8=0
x(x+1/8)=0
x=0
x=-1/8
3) (-x²-1)/8=x/8
-x²-1-x=0
x²+x+1=0
D=1-4*1*1=-3 D<0 => нет корней
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Answers & Comments
Verified answer
1) 4x²+(-1x)+(-1)=04x²-x-1=0
D=(-1)²-4*4*(-1)=1+16=17
x₁=(1+√17)/8
x₂=(1-√17)/8
2) -x²/(1/8)=x
-x²=x/8
-x²-x/8=0
x²+x/8=0
x(x+1/8)=0
x=0
x=-1/8
3) (-x²-1)/8=x/8
-x²-1-x=0
x²+x+1=0
D=1-4*1*1=-3 D<0 => нет корней