document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=67147>Question 67147</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi, <BR>\n" );
document.write( "I seem to be having problems plotting a quadratic graph.<BR>\n" );
document.write( "I have the following formula<BR>\n" );
document.write( "pi r^2 + 180r - 6000 = 0<BR>\n" );
document.write( "My two values for r are r(x) = 29 or r(x) = -64\r<BR>\n" );
document.write( "\n" );
document.write( "However, when creating a table to create the graph, I am getting very strange values to plot the Y axis with. Such as:<BR>\n" );
document.write( "r(x) = -64 so y = -30388 while r(x) = 29 y = 1862 <BR>\n" );
document.write( "Which in turn does not give the desirable \"U\" shape quadratics graph but more like a linear straight line graph.<BR>\n" );
document.write( "Any help would be much appreciated<BR>\n" );
document.write( "Thanks<BR>\n" );
document.write( "Shaun Halliday </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #47757 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=47757\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I seem to be having problems plotting a quadratic graph.<BR>\n" );
document.write( "I have the following formula<BR>\n" );
document.write( "pi r^2 + 180r - 6000 = 0<BR>\n" );
document.write( "My two values for r are r(x) = 29 or r(x) = -64<BR>\n" );
document.write( "However, when creating a table to create the graph, I am getting very strange values to plot the Y axis with. Such as:<BR>\n" );
document.write( "r(x) = -64 so y = -30388 while r(x) = 29 y = 1862<BR>\n" );
document.write( "Which in turn does not give the desirable \"U\" shape quadratics graph but more like a linear straight line graph.<BR>\n" );
document.write( ":<BR>\n" );
document.write( "I put y = 3.14x^2 + 180x - 6000 into the graphing feature on this website, using a scale of x:-100,=50 and y:+/-10000. I got:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+200%2C+-100%2C+50%2C+-10000%2C+10000%2C+3.14x%5E2+%2B+180x+-+6000%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+200%2C+-100%2C+50%2C+-10000%2C+10000%2C+3.14x%5E2+%2B+180x+-+6000%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "For x = 29, I got your value of 1862, but for x = -64, I got -4652<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Here is a table for some values for x, including the two that you mentioned, <BR>\n" );
document.write( " x  |  y<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "-90 | +3246<BR>\n" );
document.write( "-64 | -4652<BR>\n" );
document.write( "-50 | -7146<BR>\n" );
document.write( "-30 | -8573<BR>\n" );
document.write( "-10 | -7486<BR>\n" );
document.write( "  0 | -6000<BR>\n" );
document.write( "+20 | -1143<BR>\n" );
document.write( "+29 | +1862<BR>\n" );
document.write( "+40 | +6227<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Plotting these should look just like the graph above\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );