![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
The expression is 121![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2c79e0d5788750e7a50decf451e8857d.png\")
15.
= (120 + 1)15 (Write 121 as the sum of 120 and 1)
\Distribute terms using distributive property: a(b + c) = ab + ac.
\= 12015 + 115 (Distribute 15)
= 1800 + 15 (Multiply: 12015 = 1800 and 115 = 15)
= 1815 (Add: 1800 + 15 = 1815)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The product is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=00772475ac9598a6317696453d5ef8c3.png\")
.