A rational root of an equation 
is a root that is a rational
number. For a polynomial with integer coefficients,
the possible rational roots are restricted by the rational
zero theorem.
Rational Root
See also
Rational Number, Rational Zero Theorem, RootExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Rational Root." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/RationalRoot.html