The expression is .
The product of two numbers with same signs is positive.
(Multiply: )
The product of the expression is .
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a5cee4f9db6f9aa567eee9c8d8f265fe.png\")
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(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1959132b0819e72be39d2dbf50840958.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
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.