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абылхаир2
@абылхаир2
June 2022
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Решите даю 30 балов
Я обвёл жёлтым
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anassstass
-1/3х² + 3 = х² + 3х
-1/3х² + 3 - х² - 3х = 0
-1 1/3х² - 3х + 3 = 0
1 1/3х² + 3х - 3 = 0 | * 3
4х² + 9х - 9 = 0
D = 81 + 144 = 225 = 15²
x1 = -9 - 15 / 8 = -3
x2 = -9 + 15 / 8 = 0,75
y = x² + 3x
Если х = -3, то:
у = 9 - 9 = 0
Если х = 0,75, то:
у = 0,5625 + 2,25 = 2,8125
Ответ: (-3; 0); (0,75; 2,8125)
1 votes
Thanks 1
broccoli01
D=81-4*4*(9)=225
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Thanks 0
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Answers & Comments
-1/3х² + 3 - х² - 3х = 0
-1 1/3х² - 3х + 3 = 0
1 1/3х² + 3х - 3 = 0 | * 3
4х² + 9х - 9 = 0
D = 81 + 144 = 225 = 15²
x1 = -9 - 15 / 8 = -3
x2 = -9 + 15 / 8 = 0,75
y = x² + 3x
Если х = -3, то:
у = 9 - 9 = 0
Если х = 0,75, то:
у = 0,5625 + 2,25 = 2,8125
Ответ: (-3; 0); (0,75; 2,8125)
D=81-4*4*(9)=225