Answer: ±1, ±3, ±9, ±
Explanation:
f(x)=3x⁴+7x³+2x²+9
To find all possible roots, you take the last number and all its factors and put it over the first number and all its factors.
Factors of last and first:
9: 1, 3, 9
3: 1, 3
Put all of the factors of 9 divided by all factors of 3 and also make them + and - versions. Also eliminate any repeats like ±
and ±

±1, ±3, ±9, ±