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Math Help - Rational Zero Test

  1. #1
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    .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
    Last edited by CaptainBlack; May 20th 2010 at 08:17 PM.
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  2. #2
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    Quote Originally Posted by eichyess View Post
    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
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  3. #3
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    i dont understand?
    Last edited by CaptainBlack; May 20th 2010 at 08:17 PM.
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  4. #4
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    Quote Originally Posted by CaptainBlack View Post
    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
    Quote Originally Posted by eichyess View Post
    i dont understand?
    In this case it means that possible values of a are \pm 1, \pm 2 and b are 1, 2, 4

    CB
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