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katerfnz1
@katerfnz1
July 2022
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ПОМОГИТЕ ПОЖААЛУЙСТАА
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Лавган
Решение задания на фото
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Никита999111
1)
X^2+2x-63=0
D=4-4*1*(-63)=4+252=256
X1=-2+16/2=7
X2=-2-16/2=-9
2)
-7x^2-46x+21=0
D=2116-4*(-7)*21=2116+588=2704
X1=46-52/-14=-6/-14=3/7
X2=46+52/-14=98/-14=-7
3)
25x^2-30x+9=0
D=900-4*25*9=900-900=0
X=30/50=3/5
4)
2x^2+3x+5=0
D=9-4*2*5=9-40=-31
Решений нет
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Answers & Comments
X^2+2x-63=0
D=4-4*1*(-63)=4+252=256
X1=-2+16/2=7
X2=-2-16/2=-9
2)
-7x^2-46x+21=0
D=2116-4*(-7)*21=2116+588=2704
X1=46-52/-14=-6/-14=3/7
X2=46+52/-14=98/-14=-7
3)
25x^2-30x+9=0
D=900-4*25*9=900-900=0
X=30/50=3/5
4)
2x^2+3x+5=0
D=9-4*2*5=9-40=-31
Решений нет