The expression is .
(Apply associative property of multiplication: )
(The product of two same signs is positive)
(Multiply: )
The product is 800.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eba6f2c2bf040952eee06c1c0c7270c6.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1a86147111deabd7188ea3fc772699c8.png\")
(Apply associative property of multiplication: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a9e4e1added4b105cbd9e363446c61bb.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3f6058f1b7ea48fce021fbb8737f4945.png\")
(The product of two same signs is positive)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d3311b04eb743caab7caa0053a57408e.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b04b08622ee273e96c6ecd1c1b289a56.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c20d7344681c837dc7f47e0ace5f5fd6.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=857a0c95f5fc7ed76f52470aa0025e71.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")