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anyafrolova20
@anyafrolova20
June 2022
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Решите квадратные уравнения:
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математик2011
3х+4 = х² ОДЗ: 16 - х²≠0
х²-3х-4=0 х ≠ 4, х≠ -4
х₁+х₂=3
х₁*х₂= -4
х₁ = 4
х₂ = -1
Ответ: х = -1
3х + 8(х-5) = 2х(х-5) ОДЗ: х≠0, х≠5
3х + 8х - 40 = 2х² - 10х
2х² - 21х + 40 = 0
Д = 21² - 320 = 441 - 320 =121
х₁ = (21+11)/4 = 32/4 = 8
х₂ = (21-11)4 = 10/4 = 2,5
Ответ: 8 и 2,5
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Answers & Comments
х²-3х-4=0 х ≠ 4, х≠ -4
х₁+х₂=3
х₁*х₂= -4
х₁ = 4
х₂ = -1
Ответ: х = -1
3х + 8(х-5) = 2х(х-5) ОДЗ: х≠0, х≠5
3х + 8х - 40 = 2х² - 10х
2х² - 21х + 40 = 0
Д = 21² - 320 = 441 - 320 =121
х₁ = (21+11)/4 = 32/4 = 8
х₂ = (21-11)4 = 10/4 = 2,5
Ответ: 8 и 2,5