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Lalalendok
@Lalalendok
July 2022
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Алгебра дискриминант
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mmmmmm29
1)x^2+7x+6=0
D=49-4*6=25
x1=-7-5/2=-6
x2=-7+5/2=-2
2)x^2+3x-54=0
D=9-4*(-54)=225
x1=-3-15/2=-9
x2=-3+15/2=6
3)4x^2-5x=0
x(4x-5)=0
x1=0
4x-5=0
x2=1.25
4)1/4x^2-1=0
x^2-4=0
x1=2
x2=-2
5)x^2-16=0
x1=4
x2=-4
6)x^2+x=56
x^2+x-56=0
D=1-4*(-56)=225
x1=-1-15/2=-8
x2=-1+15/2=7
7)x^2-4x=5
x^2-4x-5=0
D=16-4*(-5)=36
x1=4-36/2=-16
x2=4+36/2=20
8)x^2-45=-4x
x^2+4x-45=0
D=16-4*(-45)=196
x1=-4-14/2=-9R
x2=-4+14/2=5
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Answers & Comments
D=49-4*6=25
x1=-7-5/2=-6
x2=-7+5/2=-2
2)x^2+3x-54=0
D=9-4*(-54)=225
x1=-3-15/2=-9
x2=-3+15/2=6
3)4x^2-5x=0
x(4x-5)=0
x1=0
4x-5=0
x2=1.25
4)1/4x^2-1=0
x^2-4=0
x1=2
x2=-2
5)x^2-16=0
x1=4
x2=-4
6)x^2+x=56
x^2+x-56=0
D=1-4*(-56)=225
x1=-1-15/2=-8
x2=-1+15/2=7
7)x^2-4x=5
x^2-4x-5=0
D=16-4*(-5)=36
x1=4-36/2=-16
x2=4+36/2=20
8)x^2-45=-4x
x^2+4x-45=0
D=16-4*(-45)=196
x1=-4-14/2=-9R
x2=-4+14/2=5