SOLUTION: Hello friends, I am trying to use the rational roots theorem to find the zeros it has failed every time I know the graph crosses the x axis . I have tried the P/q and listed ever

Algebra ->  Finance -> SOLUTION: Hello friends, I am trying to use the rational roots theorem to find the zeros it has failed every time I know the graph crosses the x axis . I have tried the P/q and listed ever      Log On


   

Question 967777: Hello friends, I am trying to use the rational roots theorem to find the zeros it has failed every time I know the graph crosses the x axis . I have tried the P/q and listed every possible factor . Here is the polynomial . -x^3+3x^2+5 . I must be missing a detail. Thank you in advance !!!!
Answer by josgarithmetic(39628) About Me  (Show Source):
You can put this solution on YOUR website!
Are you forgetting the x term in the dividend for synthetic division?

Repeating: Are you forgetting the highlight_green%280%2Ax%29 term in the dividend for synthetic division?

Also, are you SURE that this polynomial has RATIONAL roots? If you have some indication that your polynomial crosses or touches the x-axis, then this means it has some or at least one REAL root.

Try using a software-based graphing tool. You will find only one real root, very very near to 3.426, but less than this quantity. The one real root is irrational.