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19 October, 18:07

If a polynomial function f (x) has roots - 9 and 7 - i, what must be a factor of f (x) ?

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  1. 19 October, 18:22
    0
    F (x) has roots - 9, and 7 - i.

    Therefore x = - 9, x = 7 - i

    x + 9 = 0 x - 7 + i = 0

    (x + 9) must be a factor. (x + i - 7) must also be a factor.

    Therefore (x + 9) and (x + i - 7) must be factors.
  2. 19 October, 18:28
    0
    The conjuate of 7-i which is 7+i
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