The expression is .
If
(Substitute )
(Multiply: )
= 120 (Product of two same signs is positive)
The value of expression is 120.
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.![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e87ce5cd2b2478d5f9695cf455fd88b7.png\")
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(Substitute )![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ad47548cb0b35e57c0f13f4cd0ee3e27.png\")
(Multiply: ![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e74205b1c7d95180e36f60867ebd3631.png\")
)![\"\"](\"http://c4anything.com/userfiles/image/steps_images/solution.JPG\")