![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
First factor the each term in the expression.
\15f = 3 · 5 · f
\18 = 2 · 3 · 3
\The GCF is the product of the common prime factors in each term.
\GCF = 3
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Write each term as a product of the GCF and its remaining factors.
\15f + 18 = 3(5f) + 3(6)
\Combine like terms uisng distribuitve property: ab + ac = a(b + c).
\15f + 18 = 3(5f + 6)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
Simplified expression is 3(5f + 6).