Final answer:
The greatest common factor of 3u3 and 3u is 3u.
Step-by-step explanation:
The greatest common factor is the largest number that divides evenly into two or more numbers.
To find the greatest common factor of 3u3 and 3u, we need to find the common factors of both numbers.
Factoring 3u3: 3u3 = 3 * u * u * u.
The factors of 3u3 are 1, 3, u, u, u, 3u, and 3u3.
Factoring 3u: 3u = 3 * u.
The factors of 3u are 1, 3, u, and 3u.
The greatest common factor of 3u3 and 3u is 3u.