Question

According to the rational root theorem, which is not a possible rational root of 5x3 + 3x2 – 2x + 15 = 0?

Answer 1

p/q = { 1,-1,3,-3, 5,-5} / { 1,-1,3,-3,5,-5}

now form fractions from the two sets (every possible fraction), rejecting repeats

Answer 2

those are the set of all possible rational roots