Friday

August 1, 2014

August 1, 2014

Posted by **Bella** on Friday, August 24, 2012 at 9:58pm.

f(x)=x^3+10x^2-13x-22

find real zeros of f?

use real zeros to factor f?

- college algebra -
**drwls**, Friday, August 24, 2012 at 10:04pmI suggest you start by using the rational roots theorem to find at least one root. You will learn more by making the effort yourself.

- college algebra -
**Bella**, Friday, August 24, 2012 at 10:15pmIf I understood it I would not have to ask for help! I got it wrong in the 1st place and wanted to see the right answer. Thank you!!

- college algebra -
**drwls**, Friday, August 24, 2012 at 10:20pmThe theorem says that if there is a rational root, it is (in this case) a factor of 22, which are one or more ofthese:

+/1, +/-2, +/-11 or +/-22.

See if any of those work.

- college algebra -
**Bella**, Friday, August 24, 2012 at 10:34pmthank you!

- college algebra -
**drwls**, Friday, August 24, 2012 at 10:44pmx = 2 is a solution and (x-2) is a factor.

The other factor is

(x^3+10x^2-13x-22)/(x-2)

Polynomial long division will reduce that to a quadratic.

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