The function is .
(Replace x with r)
(Apply distributive property: a(b + c) = ab + ac)
(Multiply: )
The value of the function is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b301276fa700aa5d353ce2fb0b77dde0.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a53f20afc2c6723e00ea1f874779b59d.png\")
(Replace x with r)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8e008365bd3d655289dd7fb6a29763da.png\")
(Apply distributive property: a(b + c) = ab + ac)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=12ba3eb38ca702373eda25547421e3bc.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=04b070cad1fd32ce0f05b85df2668b07.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1b97ca81e508f9ad3d6507f4a36c5d1b.png\")
.