The vertex of the parabola is .
The standard form of horizontal parabola equation is .
The parabola passes through the point .
Substitute and in .
The parabola equation is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5e016f615982999352b768f308f09a8e.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=491f90034806cc30f61c8ee6ce5b910f.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ef4136537c73d9bca4bcf5accfe030e3.png\")
. and in .![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=153a2eb23dd2595ef407e26ee4eae2b6.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a5644ef06f3dd1eda8a04a7aec69b149.png\")
and in .![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3be36281d3a0a294d22876092abb7239.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e1cca026d3b97c4cbff9f85fb4dca7d3.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e1cca026d3b97c4cbff9f85fb4dca7d3.png\")
.