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darinamajskaya
@darinamajskaya
July 2022
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Решите ур-е
x^2 - 21=4x
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fridi93
X^2-4x-21=0
D=-b-4ac=-(-4)^2-4*1*(-21))=16+84=100
x1=(4+10)/2=7
x2=(4-10)/2=-3
1 votes
Thanks 0
darinamajskaya
Спасибо)
russian1488man
X^2-4x-21=0
D=16-4*(-21)*1=100
x1=4+10/2=7
x2=4-10/2=-3
2 votes
Thanks 1
darinamajskaya
Спасибо)
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Answers & Comments
D=-b-4ac=-(-4)^2-4*1*(-21))=16+84=100
x1=(4+10)/2=7
x2=(4-10)/2=-3
D=16-4*(-21)*1=100
x1=4+10/2=7
x2=4-10/2=-3