1. ## .Rational Zero Test

use the rational zero test to list all possible rational zeros of f for: f(x) = 4x^5-8x^4-5x^3+10x^2+x-2

2. Originally Posted by eichyess
use the rational zero test to list all possible rational zeros of f for: f(x) = 4x^5-8x^4-5x^3+10x^2+x-2
Well the rational roots theorem tells you that all the rational roots are of the form a/b where a is a (positive or negative) divisor of the constant term and b a divisor of the coefficient of the term of highest degree.

So list them and you are done.

CB

3. i dont understand?

4. Originally Posted by CaptainBlack
Well the rational roots theorem tells you that all the rational roots are of the form a/b where a is a (positive or negative) divisor of the constant term and b a divisor of the coefficient of the term of highest degree.

So list them and you are done.

CB
Originally Posted by eichyess
i dont understand?
In this case it means that possible values of $\displaystyle a$ are $\displaystyle \pm 1$, $\displaystyle \pm 2$ and $\displaystyle b$ are $\displaystyle 1, 2, 4$

CB