Answer:
3x
Explanation:
From the expression 9x³ and 12x.
The largest factor that divides each of the given expression is called the greatest common factor
Factoring each term
9x³ = 3 * 3 * x * x * x
= (3x) 3x²
12x = 3 * 2 * 2 * x
= (3x) 4
Therefore, the greatest common factor is 3x