document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=936635>Question 936635</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the equation of parabola? if  Directrix is y=1 Length of latesrectum is 8, opens downward. (With explanation)<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #570086 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=570086\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the vertex form of a Parabola opening up(a>0) or down(a<0), <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=a%28x-h%29%5E2+%2Bk ALIGN=MIDDLE  ALT=\"y=a%28x-h%29%5E2+%2Bk\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "where(h,k) is the vertex  and  x = h  is the Line of Symmetry , <BR>\n" );
document.write( "the focus is (h,k + p), With Directrix y = (k - p), a = 1/(4p)<BR>\n" );
document.write( "......<BR>\n" );
document.write( "recommend starting with a sketch of the curve<BR>\n" );
document.write( "Directrix is y=1, Length of latesrectum = 8, p = 2, a =1/(4p)= 1/8<BR>\n" );
document.write( "v(0,-1)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+%281%2F8%29x%5E2+-1 ALIGN=MIDDLE  ALT=\"y+=+%281%2F8%29x%5E2+-1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28300%2C300%2C++++-10%2C10%2C-10%2C10%2C++++%0D%0A+grid%281%29%2C%0D%0Acircle%280%2C+-1%2C0.4%29%2C%0D%0Acircle%280%2C+-3%2C0.4%29%2C%0D%0Aline%28-4%2C-3%2C4%2C-3%29%2C%0D%0A%0D%0Agraph%28+300%2C+300%2C+-10%2C10%2C-10%2C10%2C0%2C1%2C+-%281%2F8%29x%5E2+-+1%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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