document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=74142>Question 74142</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0078279992/algebrahomeworkh>Algebra 2</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I am trying to figure out what y=-4x^2+8x-1 in vertex form would be.\r<BR>\n" );
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document.write( "I know that I need to complete the square. I think I am supposed to add 1 and then balance it by subtracting 1? ((-2/2)^2=1)\r<BR>\n" );
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document.write( "y=(-4x^2+8x+1)-1+1. \r<BR>\n" );
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document.write( "Is that what I was supposed to do? If so, how do I write that as a perfect square to get the vertex form? Please help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #53140 by </B><A HREF=/tutors/aboutme.mpl?userid=funmath><B>funmath(2933)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=funmath><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=53140\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y=-4x^2+8x-1 in vertex form<BR>\n" );
document.write( "Vertex form is y=(x-h)^2+k, where (h,k)=vertex<BR>\n" );
document.write( "y=-4(x^2-2x+___)+4(__)-1<BR>\n" );
document.write( "y=-4(x^2-2x+(-2/2)^2)+4(-2/2)^2-1<BR>\n" );
document.write( "y=-4(x^2-2x+(-1)^2)+4(-1)^2-1<BR>\n" );
document.write( "y=-4(x^2-2x+1)+4(1)-1<BR>\n" );
document.write( "y=-4(x-1)^2+3<BR>\n" );
document.write( "The vertex is now easily determined to be: (1,3)<BR>\n" );
document.write( "Happy Calculating!!!! </SPAN>\n" );
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