Mark M. answered 12/08/21
Retired college math professor. Extensive tutoring experience.
If p/q is a rational root of the given polynomial, then p must be a divisor of the constant term, -1 and q must be a divisor of the leading coefficient, 3.
So, p = 1 or -1 and q = 1, -1, 3, or -3.
Therefore, the only possible rational roots are 1, -1, 1/3, and -1/3,