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P.nut1996

More help, please?? Using complete sentences, explain how the Rational Root Theorem and Descartes’ Rule of Signs are used to find the zeros of a polynomial function.

  • one year ago
  • one year ago

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  1. Holylion94
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    i don't know about rational root theorem but Descartes’ Rule of Signs is very simple. you take a polynomial, and see number of sign variation in the equation. then that many positive real roots will be there. eg: x^3-x^2+x-3=0 sign change like + - + - there are three changes, so there are 3 positive roots. next you replace x by -x(x-----> -x) then for that equation number of change in sign results the number of negative roots. so in the given eg: replace x by -x -x^3-x^2-x-3=0 so sign change is like - - - - that is no change => no negative roots. so this way we can find no. of positive and negative real roots and remaining are complex.

    • one year ago
  2. P.nut1996
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    Thank you so so much! you were a great help! :D

    • one year ago
  3. Holylion94
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    no problem :)

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