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

Question

Mathematics

Tia Ball

31 July, 06:54

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

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Answers (2)

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Philip · Answer 1

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.

Shayla Doyle · Answer 2

Shayla Doyle 31 July, 08:22

0

The conjuate of 7-i which is 7+i