\
Use the definition of negative exponents :
Where
.
\
\
\
The positive exponent of
.
\
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Where ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=42a566b19f0d56198585965f5a36766c.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a95544396ffddc19d370bc8040496280.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.