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Mandarin47
@Mandarin47
July 2022
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помогите решить, пожалуйста. подробно...
x^6 -14x^4+56x^2-64=0
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sangers1959
Verified answer
X⁶-14x⁴+56x²-64=0
Пусть x²=t ⇒
t³-14t²+56t-64=0
(t³-64)-(14t²-56t)=0
(t³-4³)-14t*(t-4)=0
(t-4)*(t²+4t+16)-14t*(t-4)=0
(t-4)*(t²+4t+16-14t)=0
t-4=0
t₁=4 ⇒ x²=4 x₁=2 x₂=-2
t²-10t+16=0 D=36
t₂=2 ⇒ x²=2 x₃=√2 x₄=-√2
t₃=8 ⇒ x²=8 x₅=2√2 x₆=-2√2
Ответ: x₁=2 x₂=-2 x₃=√2 x₄=-√2 x₅=2√2 x₆=-2√2.
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Answers & Comments
Verified answer
X⁶-14x⁴+56x²-64=0Пусть x²=t ⇒
t³-14t²+56t-64=0
(t³-64)-(14t²-56t)=0
(t³-4³)-14t*(t-4)=0
(t-4)*(t²+4t+16)-14t*(t-4)=0
(t-4)*(t²+4t+16-14t)=0
t-4=0
t₁=4 ⇒ x²=4 x₁=2 x₂=-2
t²-10t+16=0 D=36
t₂=2 ⇒ x²=2 x₃=√2 x₄=-√2
t₃=8 ⇒ x²=8 x₅=2√2 x₆=-2√2
Ответ: x₁=2 x₂=-2 x₃=√2 x₄=-√2 x₅=2√2 x₆=-2√2.