Factor 9z+18

To factor the expression \(9z + 18\) using the greatest common factor (GCF), we first need to identify the GCF of the two terms.

The terms are:

• \(9z\)
• \(18\)

The GCF of \(9\) and \(18\) is \(9\).

Now, we can factor out the GCF \(9\) from each term:

\[ 9z + 18 = 9(z) + 9(2) = 9(z + 2) \]

Thus, the factored form of \(9z + 18\) is:

\[ \boxed{9(z + 2)} \]