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TRISTON
Lv 4
Can someone show me how to find the other zeros in this problem F(x)=x^4-3x^3-20x^2-24x-8?
I know the rational zeros are -2 and -1. I also know the other zeros are 3+sqrt13 and 3-sqrt13. i just can't get the other zeros to add up. I have (x+1)(x+2)(x^2-6x-4). I just keeping getting the wrong sqrt #. Please help.
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- answer_manLv 41 decade agoFavorite Answer
A 4th order polynomial has 4 roots so you should only be able to find 4 numbers.
You can use the quadratic formula to get the roots of the last factor
Source(s): http://en.wikipedia.org/wiki/Quadratic_formula#Qua... http://en.wikipedia.org/wiki/Quadratic_formula#Com...
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