According to the Rational Root Theorem, what are all the potential rational roots of f (x) = 9x^4 - 2x^2 - 3x + 4?

This would be all the combinations of the factors of the constant (P) divided by the factors of the leading coefficient (Q).

Factors of 4: 1 2 4

Factors of 9: 1 3 9

P/Q combinations:

1, 1/3, 1/9, 2, 2/3, 2/9, 4, 4/3, 4/9