document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=340886>Question 340886</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This equation is a word problem for ticket sales in the form of a formula. The equation is -0.2x^2 + 12x + 11. I have changed the signs to begin with. a=.2x^2 b=-12 and c=-11, the equation solver for the plotted points is -b+/- sqrt b^2 -4ac/2a is where I have started. I have come up with 135.2/.4 in this formula. Is this correct? To determine the last day of the ticket sales and the peak day or days for sales, is what I am having trouble with. Could you give me a step by step explanation of the the solutions, I have to have a visual aid to help me understand.     </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #244163 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=244163\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  This equation is a word problem for ticket sales in the form of a formula. The equation is -0.2x^2 + 12x + 11. I have changed the signs to begin with. a=.2x^2 b=-12 and c=-11, the equation solver for the plotted points is -b+/- sqrt b^2 -4ac/2a is where I have started. I have come up with 135.2/.4 in this formula. Is this correct? To determine the last day of the ticket sales and the peak day or days for sales,<BR>\n" );
document.write( "---<BR>\n" );
document.write( "sales = -0.2x^2+12x+11<BR>\n" );
document.write( "a = -0.2 ; b = 12 ; c = 11<BR>\n" );
document.write( "----<BR>\n" );
document.write( "x = [-12 +- sqrt(144-4*-0.2*11)]/(2*-0.2)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = [-12 +- sqrt(152.8)]/-0.4<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "x = [-12 +- 12.36]/(-0.4)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = (0.36/-0.4) or x = (-24.36/-0.4)<BR>\n" );
document.write( "x = -0.9 or x = 60.9<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Last day of ticket sales is day 60<BR>\n" );
document.write( "Peak day for sales is day 30<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28400%2C300%2C-10%2C70%2C-10%2C225%2C-0.2x%5E2%2B12x%2B11%29 ALIGN=MIDDLE  ALT=\"graph%28400%2C300%2C-10%2C70%2C-10%2C225%2C-0.2x%5E2%2B12x%2B11%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );