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OpenStudy (anonymous):
Two roots of a 3-degree polynomial equation are 5 and -5. Which of the following cannot be the third root of the equation? a.5 b.5i c.0 d.-5 e.-5i
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OpenStudy (anonymous):
Complex roots come in conjugate pairs i.e, you CANNOT only have 1 complex root. Since your problem has only one unknown root, you can automatically eliminate any options that have "i" in them.
OpenStudy (anonymous):
so just the ones with i?
OpenStudy (anonymous):
Yep. All the other ones are possible to exist.
OpenStudy (anonymous):
okay thank you
OpenStudy (anonymous):
Np
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