Arbitrary constants of 2nd order linear ODE with negative discriminant are complex conjugates?











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I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.










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  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01















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I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.










share|cite|improve this question






















  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.










share|cite|improve this question













I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.







differential-equations complex-numbers






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share|cite|improve this question











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asked Nov 17 at 14:16









K.defaoite

11




11












  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01


















  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01
















Something like this answer? Where exactly do your problems start?
– LutzL
Nov 17 at 14:59




Something like this answer? Where exactly do your problems start?
– LutzL
Nov 17 at 14:59












I didn't spot this when I posted the question. Thank you so much!
– K.defaoite
Nov 18 at 12:01




I didn't spot this when I posted the question. Thank you so much!
– K.defaoite
Nov 18 at 12:01















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