document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1038139>Question 1038139</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The drama club is building a backdrop using arches whose shape can be represented by the function f(x) = -x^2 + 2x + 8, where x is the length in feet. The area under each arch is to be covered with fabric.<BR>\n" );
document.write( "http://prntscr.com/bge4kt\r<BR>\n" );
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document.write( "What is the height of the arch?<BR>\n" );
document.write( "10 feet<BR>\n" );
document.write( "9 feet<BR>\n" );
document.write( "8 feet<BR>\n" );
document.write( "6 feet </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #652856 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=652856\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -x^2+2x+8<BR>\n" );
document.write( "The vertex is at -b/2a and the x value is -2/-2 or 1. The y-value is -1+2+8=9<BR>\n" );
document.write( "The y-intercept is at (0,8)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C200%2C-10%2C10%2C-10%2C10%2C-x%5E2%2B2x%2B8%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C200%2C-10%2C10%2C-10%2C10%2C-x%5E2%2B2x%2B8%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The vertex is 9 feet from the floor or the y-axis in this instance.<BR>\n" );
document.write( "Other questions ask about the floor space under the arch, and that is 6 feet, judging by the x-intercepts. </SPAN>\n" );
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