The quadratic function is .
When the value of the slope of the function increases as gets increases ,the parabla opens upward .
When the value of the slope of the function decreases as gets decreases ,the parabla opens down ward .
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the slope of the function increases as ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
gets increases ,the parabla opens upward .![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f7cfbb5a457b182bccb235f0a1c6c865.png\")
the slope of the function decreases as ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
gets decreases ,the parabla opens down ward .