The expression is .
(Definition of zero exponent) \ \
(Definition of negative exponent)
The solution is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6105f2a0c13c117eef9124fca2084963.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8703639f5df400d836b2dc4853cec87b.png\")
(Definition of zero exponent) \ \
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cae946014bf382b68c512e599967e542.png\")
(Definition of negative exponent)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=870f3bc31fc434c122ddad0723f263a8.png\")
.