![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
First factor the each term in the expression.
\15 = 3 · 5.
\20x = 2 · 2 · 5 · x
\The GCF is the product of the common prime factors in each term.
\GCF = 5
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Write each term as a product of the GCF and its remaining factors.
\15 + 20x = 5 (3) + 5 (4x)
\Combine like terms uisng distribuitve property: ab + ac = a(b + c)
\15 + 20x = 5 (3 + 4x)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
Simplified expression is 5(3 + 4x).