document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=991228>Question 991228</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The cross section of a flashlight is a parabola. The bulb is at the focus. Suppose the bulb is located 1/4 in from the vertex of the reflector. The width of the cross section through the bulb is 2 in. What is an equation for this parabola? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #611161 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39616)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=611161\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Try like this:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=ax%5E2 ALIGN=MIDDLE  ALT=\"y=ax%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > for vertex at the origin.  A point on the parabola reflector is  (1,1/4) using your second part of the description.  That is 1 inch on each \"side\" in the cross section at the bulb.  That makes the two inch cross section.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F4=a%2A1%5E2 ALIGN=MIDDLE  ALT=\"1%2F4=a%2A1%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=1%2F4 ALIGN=MIDDLE  ALT=\"a=1%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=%281%2F4%29x%5E2 ALIGN=MIDDLE  ALT=\"y=%281%2F4%29x%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >, but this may not match the first part of the description for the bulb at the focus, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F4 ALIGN=MIDDLE  ALT=\"1%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" > inch from the vertex.  Recheck your problem description to be sure. </SPAN>\n" );
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