Given the following function:

You need to apply the Rational Roots Test:
1. By definition, if the function has Whole coefficients, then its Rational roots have this form:

Where "p" represents of the factors of the Constant term and "q" represents all the factors of the Leading coefficient.
2. Identify that Leading coefficient. This is:

3. Identify that Constant term. In this case this is:

4. Find all the factors of the Leading coefficient (positive and negative):

5. Find all the factors of the Constant term (positive and negative):

6. You can set up that:

7. Find all the combinations

You need to divide the numerator by each denominator. Since the denominator is 1:

8. Since there are no duplicates, the next step is to substitute each value into the function. Remember that, If:

then "a" is a root of the polynomial.
Then:

The answer is:
