SOLUTION: I don't understand this question at all please help... Using complete sentences, describe how you would find all possible rational zeros of the polynomial function f(x) = 4x3 – 5x

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I don't understand this question at all please help... Using complete sentences, describe how you would find all possible rational zeros of the polynomial function f(x) = 4x3 – 5x      Log On


   



Question 769950: I don't understand this question at all please help...
Using complete sentences, describe how you would find all possible rational zeros of the polynomial function f(x) = 4x3 – 5x2 + 9x – 6.
Be sure to provide the answer in your explanation

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The factors of 4 are : 1, 2, 4
The factors of -6 are: 1, 2, 3, 6, -1, -2, -3, -6.

The values to check as roots for the function are plus-or-minus 1, 2, 4, 3/2, 3, 6, 1/2, 1/4. Those are sixteen possible roots to check. You will only be able to find THREE rational roots at most. Test each possible root using synthetic division. When a zero remainder occurs, then the tested root is a root of the function.