To factor the expression \( 18m - 24n \) using the greatest common factor (GCF), we first need to identify the GCF of the coefficients \( 18 \) and \( 24 \).
The factors of \( 18 \) are: \( 1, 2, 3, 6, 9, 18 \)
The factors of \( 24 \) are: \( 1, 2, 3, 4, 6, 8, 12, 24 \)
The greatest common factor (GCF) of \( 18 \) and \( 24 \) is \( 6 \).
Now, we can factor \( 6 \) out of the expression:
\[ 18m - 24n = 6(3m - 4n) \]
Thus, the correct response is:
\[ 6(3m - 4n) \]
So, the answer is: 6(3m − 4n)