SOLUTION: If x = 3i is a root of the polynomial P(x) which has real coefficients, then what other root is guaranteed?

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Question 148500: If x = 3i is a root of the polynomial P(x) which has real coefficients, then what other root is guaranteed?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
The root x+=+3i is identical to x+=0%2B+3i. Since complex roots always come in conjugate pairs, this means that the other guaranteed root is x+=0-3i (which is the complex conjugate to x+=0%2B+3i). So the other root is either x+=0-3i or simply x+=-3i