Zidan is using the Rational Root Theorem to help find the roots of a 5th degree polynomial. He has discovered five roots and still has 4 to test. What is his next best step? 1. He should use the Factor Theorem to find the remaining polynomial roots.
2. He should test the remaining 4 roots.
3. He can stop testing because he has found all the roots.
4. He needs to pick one of the roots and use the quadratic formula to test it.