To factor the expression \( 18v + 42 \), we first look for the greatest common factor (GCF) of the terms 18 and 42.
The GCF of 18 and 42 is 6. We can factor out 6 from the expression:
\[ 18v + 42 = 6(3v + 7) \]
Thus, the factored form of \( 18v + 42 \) is:
\[ 6(3v + 7) \]
The answer is \( 6(3v + 7) \).