document.write( "Question 889232: The vertex of this parabola is at (-1, -3). Which of the following could be its equation? \n" ); document.write( "
Algebra.Com's Answer #537990 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
Anything of the form \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"y+=+a%28x%2B1%29%5E2+-+3\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Since that is in the form \"y+=+a%28x-h%29%5E2+%2Bk\" (h,k) = (-1,-3)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "'a' can be any number you want.
\n" ); document.write( "
\n" );