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ulzi2001
@ulzi2001
July 2022
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[tex] x^{4} -4 x^{2} -45=0[/tex] пожалуста помагитеее пжжж срочно нужна
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ShirokovP
Verified answer
X^4 - 4x^2 - 45 = 0
Пусть x^2 = t, тогда t^2 - 4t - 45 = 0
D = 16 + 180 = 196 = 14^2
x₁ = ( 4 + 14)/2 = 18/2 = 9;
x₂ = ( 4 - 14)/2 = - 10/2 = - 5;
x^2 = 9
x = ± √9
x = ± 3
x^2 = - 5
нет реш
Ответ:
- 3; 3
1 votes
Thanks 1
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Answers & Comments
Verified answer
X^4 - 4x^2 - 45 = 0Пусть x^2 = t, тогда t^2 - 4t - 45 = 0
D = 16 + 180 = 196 = 14^2
x₁ = ( 4 + 14)/2 = 18/2 = 9;
x₂ = ( 4 - 14)/2 = - 10/2 = - 5;
x^2 = 9
x = ± √9
x = ± 3
x^2 = - 5
нет реш
Ответ:
- 3; 3