To factor \( 48y + 36z \) using the greatest common factor (GCF), we first need to find the GCF of the coefficients 48 and 36.
The factors of 48 are: \( 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 \)
The factors of 36 are: \( 1, 2, 3, 4, 6, 9, 12, 18, 36 \)
The greatest common factor is \( 12 \).
Now, we can factor out \( 12 \) from each term:
\[ 48y + 36z = 12(4y) + 12(3z) = 12(4y + 3z) \]
So, the correct factorization is:
12(4y + 3z).