document.write( "Question 139741: Please help with problem. It comes from a homework sheet. Thank you.\r
\n" ); document.write( "\n" ); document.write( "Find the vertex of the parabola and determine whether the parabola opens upward, downward, to the left, or to the right.\r
\n" ); document.write( "\n" ); document.write( "15.) y = -(x+2)2 to the second power + 2 \n" ); document.write( "

Algebra.Com's Answer #101873 by solver91311(24713) $\"\"$ $\"About$

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Left/Right parabolas have the exponent on the y variable, so you know right off that this is an up/down situtation. Expand the binomial so that your equation is in the form $\"y=ax%5E2%2Bbx%2Bc\"$ . If $\"a%3E0\"$ , that is to say if the lead coefficient is positive, then the parabola opens upward. If $\"a%3C0\"$ , then it opens downward. Of course, if $\"a=0\"$ you don't have a parabola at all. \n" ); document.write( "

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