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7 July, 22:55

If - 3+i is a root of the polynomial function f (x), which of the following must be a root of f (x) ?

a. - 3-i

b. - 3i

c. 3-i

d. 3i

+1
Answers (2)
  1. 8 July, 02:07
    0
    Use the conjugate of the 1st solution to find the second. which is - 3 - i. or a
  2. 8 July, 02:17
    0
    When dealing with imaginary numbers as roots of a polynomial, you will see that they always occur in conjugates. So the other root that goes with this one is - 3 - i. This will always be the case.
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