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January 31, 2015

Posted by **Breanna** on Sunday, December 30, 2012 at 5:31am.

degree4, zeros i, 9+i

**I am just not getting these coefficients. I know that there has to be an easier way to learn this. Please help!!

- calculus -
**Breanna**, Sunday, December 30, 2012 at 5:33amThey want to know the:

remaining zeros of f

- calculus -
**Steve**, Sunday, December 30, 2012 at 6:01amcomplex roots come in pairs, so the others must be -i and 9-i.

Algebra I, I believe.

- calculus -
**Steve**, Sunday, December 30, 2012 at 6:04amThe reason they specify real coefficeints is so that you know the complex roots come in conjugate pairs. Otherwise, it is not true, since

(x-3)(x+i) = x^2 - 3x + ix - 3i

= x^2 + (-3+i)x - 3i

which is a perfectly useful quadratic, but its coefficients are not real, so the roots do not have to come in conjugate pairs.

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