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polinakakaxa12
@polinakakaxa12
August 2022
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1.Решить квадратные уравнения
а)9x²-7x-2=0
б)4x²-x=0
в)5x²=45
г)x²+18x-63=0
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Answers & Comments
Lyavs
а)9x²-7x-2=0
D=49-4*(-2)*9=121
x1=(7+11)/18=1
x2=(7-11)/18=2/9
б)4x²-x=0
x(4x-1)=0
x=0 и 4x=1
x=1/4
x=0.25
в)5x²=45
x^2=9
x=3 и x=-3
г)x²+18x-63=0
D=324-4*(-63)=576
x1=(-18+24)/2=3
X2=(-18-24)/2=-21
5 votes
Thanks 25
Lady228
А)D=(-7)^2-4*9*2
D=49-72
D=-23
коней нет;
б)x(4x-1)=0
x1=0;x2=4x-1=0,4x=1,x=1/4;
в)x^2=9
x=3;
г) D=18^2-4*1*(-63)
D=324+252
D=576
x1=-18-24/2=-21;x2=-18+24/2=3.
2 votes
Thanks 2
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Answers & Comments
D=49-4*(-2)*9=121
x1=(7+11)/18=1
x2=(7-11)/18=2/9
б)4x²-x=0
x(4x-1)=0
x=0 и 4x=1
x=1/4
x=0.25
в)5x²=45
x^2=9
x=3 и x=-3
г)x²+18x-63=0
D=324-4*(-63)=576
x1=(-18+24)/2=3
X2=(-18-24)/2=-21
D=49-72
D=-23
коней нет;
б)x(4x-1)=0
x1=0;x2=4x-1=0,4x=1,x=1/4;
в)x^2=9
x=3;
г) D=18^2-4*1*(-63)
D=324+252
D=576
x1=-18-24/2=-21;x2=-18+24/2=3.