document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=767881>Question 767881</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the equation of a parabola with vertex (0, 0) and directrix x = -3. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #467947 by </B><A HREF=/tutors/aboutme.mpl?userid=DSMLMD><B>DSMLMD(16)</B></A><img src=\"/images/stars/stars-06.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=DSMLMD><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/cgi-bin/show-face.mpl?user=DSMLMD><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=467947\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Vertex at (0, 0) and directrix x = -3<BR>\n" );
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document.write( "Vertex<BR>\n" );
document.write( "(0,0)<BR>\n" );
document.write( "(a,b) <BR>\n" );
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document.write( "directrix formula: <BR>\n" );
document.write( "x = -p<BR>\n" );
document.write( "x = -(-3)<BR>\n" );
document.write( "x = 3<BR>\n" );
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document.write( "because the directrix located at x-coordinate, the parabola equation is:<BR>\n" );
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document.write( "(y-b)^2 = 4p(x-a)<BR>\n" );
document.write( "(y-0)^2 = 4(3)(x-0)<BR>\n" );
document.write( "y^2 = 12x </SPAN>\n" );
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