To factor the expression \( 24u + 18 \), we start by finding the greatest common factor (GCF) of the coefficients 24 and 18.
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List the factors:
- The factors of 24 are: \( 1, 2, 3, 4, 6, 8, 12, 24 \)
- The factors of 18 are: \( 1, 2, 3, 6, 9, 18 \)
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The GCF of 24 and 18 is 6.
Now, we can factor out the GCF (6) from the expression:
\[ 24u + 18 = 6(4u + 3) \]
Thus, the factored form of \( 24u + 18 \) is:
\[ \boxed{6(4u + 3)} \]
This represents the expression as a product with a whole number greater than 1.