The expression is .
( written as )
Apply associative property of multiplication: .
(The product of two different signs is negative)
The simplified expression is .
![\"\"](\"../../../userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=74188abe4ed13d0e2585eaeb7adfaeaf.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6c8a90d1401a7b439c93cc4b116e2c74.png\")
(![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=67310daf68e6943773b9ec72071e45e6.png\")
written as ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f1b76079b0ce59eac87ce26a3b96ebbb.png\")
)![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a9e4e1added4b105cbd9e363446c61bb.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0874cc3aace43cf9ccf504b335149008.png\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d82d3442010ffa4d9a8ec485da778b4f.png\")
(The product of two different signs is negative)![\"\"](\"../../../userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d521883c63099c5634b52e0da5b6bf00.png\")
.