The expression is .
Apply distributive property: a(b + c) = ab + ac.
(Distribute 4)
The simplified expression is .
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e678b6e7cec0230d9729cd2d67d00a35.png\")
(Distribute 4)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d11caea8398898d0e8af9588db996540.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.