To factor the expression \(9Z + 18\) using the greatest common factor (GCF), follow these steps:
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Identify the GCF: The coefficients of the terms are 9 and 18. The GCF of 9 and 18 is 9.
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Factor out the GCF: Now, factor 9 out of each term in the expression:
\[ 9Z + 18 = 9(Z) + 9(2) \]
This can be rewritten as:
\[ 9(Z + 2) \]
So, the factored form of \(9Z + 18\) is:
\[ \boxed{9(Z + 2)} \]