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oksivankiv
@oksivankiv
August 2022
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розвяжить уравнения
1)7х2-21=0
2)5х2+9х=0
3)х2+х-42=0
4)3х2-28х+9=0
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marierom
1)7х²
-21=0
7х
²=21
х²=21/7
х²=3
х₁=-√3
х₂=√3
2) 5х
²
+9х=0
х(5х+9)=0
х
₁
=0 или 5х+9=0
5х=-9
х=-9/5
х
₂
=-1,8
3)х
²
+х-42=0
D=1
²-4*1*(-42)=1+168=169=13²
x
₁=(-1-13)/2=-7
x
₂=(-1+13)/2=6
4)3х
²
-28х+9=0
D=(-28)
²-4*3*9=784-108=676=26²
x₁=(28-26)/6=2/6=1/3
x₂=(28+26)/6=9
17 votes
Thanks 29
oksivankiv
спасиба большое
София1707
второй пример: 5х= -9
Banabanana
Verified answer
Держи)))))))))))))))))))))
49 votes
Thanks 96
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Answers & Comments
7х²=21
х²=21/7
х²=3
х₁=-√3
х₂=√3
2) 5х²+9х=0
х(5х+9)=0
х₁=0 или 5х+9=0
5х=-9
х=-9/5
х₂ =-1,8
3)х²+х-42=0
D=1²-4*1*(-42)=1+168=169=13²
x₁=(-1-13)/2=-7
x₂=(-1+13)/2=6
4)3х²-28х+9=0
D=(-28)²-4*3*9=784-108=676=26²
x₁=(28-26)/6=2/6=1/3
x₂=(28+26)/6=9
Verified answer
Держи)))))))))))))))))))))