The expression is .
(Substitute 12, 7 and 5 for b, c and a)
(Multiply: )
= 49 (Subtract: )
The value of expression is 49.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4d6147fed83ec4e43838a2cc2cf5119c.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a3e0cff2e12cdafcb389f958804a1811.png\")
(Substitute 12, 7 and 5 for b, c and a)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2bb617cf31736cfc1543e34c3bcc5fbb.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a72e7a2c5383b9baf7cba11a60a8faf1.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=40297a05ae0a90ad815887be05f9d86c.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6af5bb27c33d75374f3251debf13bc7e.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=edca2317faa10c282bdb03bca7253c94.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")