The expression is .
Simplify the expression.
(Original equation)
(Definition of negative exponents: )
(Simplify)
.
Option B is right choice.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=117143cdce340f5f8525832a6590433c.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=117143cdce340f5f8525832a6590433c.png\")
(Original equation)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0e4b2cb29ba90986e2623ae198cc5557.png\")
(Definition of negative exponents: ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5780b651f737b90e1e006dbdbee9b431.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3210233d207393607af7952634ff3ac5.png\")
(Simplify) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b725f1ce4c0e403069d79c682b549ba7.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")