The expression is .
(Product of two same signs is positive)
(Multiply: )
The simplified expression is 45.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e46b42dd8fffdec6e855f802096771b3.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ae9a847116d40ddf40e70f737bf6c020.png\")
(Product of two same signs is positive) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f4db9a0c6a15617fe7541c3ddd6e06c4.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ff1cfabc5e9fe6f45b79327ee397c2b6.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")