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alenasabr
@alenasabr
April 2021
1
9
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пять примеров, 7 класс очень срочно надо, и точное решение прошууууу
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NightWolf123
1) x^2 + 4x
- 21 = 0
D =
4^2
- 4·1·(-21) = 16 + 84 = 100
x1 = (
-4 - √100)/
2·1
= (
-4 - 10)/2
=
-14/2
= -7
x2 = (
-4 + √100)/
2·1
= (
-4 + 10)/2
=
6/2
= 3
2) 2x^2 + 10x
= 0
D = 10^2
- 4·2·0 = 100 - 0 = 100
x1 = (
-10 - √100)/
2·2
= (
-10 - 10)/4
=
-20/4
= -5
x2 = (
-10 + √100)/
2·2
= (
-10 + 10)/4
=
0/4
= 0
3) x^2 + 3x
- 18 = 0
D = 3^2
- 4·1·(-18) = 9 + 72 = 81
x1 = (
-3 - √81)/
2·1
= (
-3 - 9)/2
=
-12/2
= -6
x2 = (
-3 + √81)/
2·1
= (
-3 + 9)/2
=
6/2
= 3
4) 5x^2 + 15x
= 0
D = 15^2
- 4·5·0 = 225 - 0 = 225
x1 = (
-15 - √225)/
2·5
= (
-15 - 15)/10
=
-30/10
= -3
x2 = (
-15 + √225)/
2·5
= (
-15 + 15)/10
=
0/10
= 0
5) x = -20
1 votes
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Answers & Comments
D = 4^2 - 4·1·(-21) = 16 + 84 = 100
x1 = (-4 - √100)/2·1 = (-4 - 10)/2 = -14/2 = -7
x2 = (-4 + √100)/2·1 = (-4 + 10)/2 = 6/2 = 3
2) 2x^2 + 10x = 0
D = 10^2 - 4·2·0 = 100 - 0 = 100
x1 = (-10 - √100)/2·2 = (-10 - 10)/4 = -20/4 = -5
x2 = (-10 + √100)/2·2 = (-10 + 10)/4 = 0/4 = 0
3) x^2 + 3x - 18 = 0
D = 3^2 - 4·1·(-18) = 9 + 72 = 81
x1 = (-3 - √81)/2·1 = (-3 - 9)/2 = -12/2 = -6
x2 = (-3 + √81)/2·1 = (-3 + 9)/2 = 6/2 = 3
4) 5x^2 + 15x = 0
D = 15^2 - 4·5·0 = 225 - 0 = 225
x1 = (-15 - √225)/2·5 = (-15 - 15)/10 = -30/10 = -3
x2 = (-15 + √225)/2·5 = (-15 + 15)/10 = 0/10 = 0
5) x = -20