document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=197604>Question 197604</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the vertex of the parabola: y= -2x^2+2x+4? When i solved it, i got the vertex as (-2,0) but all the online calculators say the vertex is (.5,4.5). Why is this? can you explain how to find the vertex? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #148176 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=148176\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the vertex of the parabola: y= -2x^2+2x+4? When i solved it, i got the vertex as (-2,0) but all the online calculators say the vertex is (.5,4.5). Why is this? can you explain how to find the vertex?<BR>\n" );
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document.write( "The vertex of a parabola is always at x = -b/2a<BR>\n" );
document.write( "In your problem a = -2 ; b = 2 ; c = 4<BR>\n" );
document.write( "x = -b/2a = -2/2(-2) = 1/2 = 0.5<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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