document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=914520>Question 914520</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Identify the focus and directrix of the parabola y=-15x^2, 6x^2-3y=0, 2y^2+10x=0!? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #555167 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=555167\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y = -15x^2 ,  Parabola opening up(a>0) or down(a<0), <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( "C(0,0)<BR>\n" );
document.write( "4p = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2Fa ALIGN=MIDDLE  ALT=\"1%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" > (Note: |4p| being the length of the latus rectum)<BR>\n" );
document.write( "p = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F4a ALIGN=MIDDLE  ALT=\"1%2F4a\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -1/60,  F(0, -1/60), Directrix y = 1/60<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28300%2C300%2C+++-6%2C+6%2C+-6%2C+6%2C+grid%281%29%2C+%0D%0Acircle%280%2C+-1%2F60%2C0.2%29%2C%0D%0Agraph%28+300%2C+300%2C+-6%2C+6%2C+-6%2C+6%2C0%2C+-15x%5E2%29%29+%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "........<BR>\n" );
document.write( "y = 2x^2 ,  Parabola opening up(a>0) or down(a<0), <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( "C(0,0)<BR>\n" );
document.write( "p = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F4a ALIGN=MIDDLE  ALT=\"1%2F4a\"   DISABLED_style= \"max-width:90%; height:auto;\" > p = 1/8,  F(0, 1/8), Directrix y = -1/8<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28300%2C300%2C+++-6%2C+6%2C+-6%2C+6%2C+grid%281%29%2C+%0D%0Acircle%280%2C1%2F8%2C0.2%29%2C+%0D%0Agraph%28+300%2C+300%2C+-6%2C+6%2C+-6%2C+6%2C0%2C-1%2F8%2C+2x%5E2%29%29+%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "............<BR>\n" );
document.write( " x = -.2x^2  Parabola opening right(a>0) or left(a<0), <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=a%28y-k%29%5E2+%2Bh ALIGN=MIDDLE  ALT=\"x=a%28y-k%29%5E2+%2Bh\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "C(0,0)<BR>\n" );
document.write( "p = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F4a ALIGN=MIDDLE  ALT=\"1%2F4a\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -1/.8 = -1.25  F(-1.25 , 0), Directrix  x = 1.25<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+blue%28line%281.25%2C10%2C1.25%2C-10%29%29++%2C++%0D%0A+grid%281%29%2C%0D%0Acircle%28-1.25%2C0%2C0.4%29%2C%0D%0Agraph%28+300%2C+300%2C+-10%2C10%2C-10%2C10%2C0%2C++sqrt%28-5x%29%2C+-sqrt%28-5x%29%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );