document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=956636>Question 956636</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The dimensions of the facade of the house, should be 7m wide and 4 ms high, it should be a parabola, use the origin of the parabola as one corner. Find the quadratic equation to that.<BR>\n" );
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document.write( "3 points are (0,0), (3.5,4) and (7,0)<BR>\n" );
document.write( "y = ax^2 + bx + c<BR>\n" );
document.write( "At x = 0, y = 0 --> c = 0<BR>\n" );
document.write( "----<BR>\n" );
document.write( "At x = 7, y = 0<BR>\n" );
document.write( "49a + 7b = 0<BR>\n" );
document.write( "7a + b = 0<BR>\n" );
document.write( "b = -7a<BR>\n" );
document.write( "---<BR>\n" );
document.write( "At x = 3.5, y = 4<BR>\n" );
document.write( "12.25a + 3.5b = 4<BR>\n" );
document.write( "Sub for b<BR>\n" );
document.write( "12.25a - 24.5a = 4<BR>\n" );
document.write( "-12.25a = 4<BR>\n" );
document.write( "a = -16/49<BR>\n" );
document.write( "---<BR>\n" );
document.write( "b = 16/7<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "And then they got <BR>\n" );
document.write( "y=16x^2/49+16x/7 <BR>\n" );
document.write( "I do not understand the process here, I am practicing for my exam and this on the practice exam, could someone please explain the process clearly to me? That would be greatly appreciated </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #584482 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=584482\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (0,0)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=0%2B0%2Bc ALIGN=MIDDLE  ALT=\"0=0%2B0%2Bc\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28c=0%29 ALIGN=MIDDLE  ALT=\"highlight%28c=0%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( "(7/2,4)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4=a%287%2F2%29%5E2%2Bb%287%2F2%29 ALIGN=MIDDLE  ALT=\"4=a%287%2F2%29%5E2%2Bb%287%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4=%2849%2F4%29a%2B%287%2F2%29b ALIGN=MIDDLE  ALT=\"4=%2849%2F4%29a%2B%287%2F2%29b\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "1.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=49a%2B14b=16 ALIGN=MIDDLE  ALT=\"49a%2B14b=16\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( "(7,0)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=a%287%29%5E2%2Bb%287%29 ALIGN=MIDDLE  ALT=\"0=a%287%29%5E2%2Bb%287%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "2.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=49a%2B7b=0 ALIGN=MIDDLE  ALT=\"49a%2B7b=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Subtract eq. 2 from eq. 1,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=49a%2B14b-49a-7b=16-0 ALIGN=MIDDLE  ALT=\"49a%2B14b-49a-7b=16-0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7b=16 ALIGN=MIDDLE  ALT=\"7b=16\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28b=16%2F7%29 ALIGN=MIDDLE  ALT=\"highlight%28b=16%2F7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Then,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=49a%2B7%2816%2F7%29=0 ALIGN=MIDDLE  ALT=\"49a%2B7%2816%2F7%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=49a%2B16=0 ALIGN=MIDDLE  ALT=\"49a%2B16=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=49a=-16 ALIGN=MIDDLE  ALT=\"49a=-16\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28a=-%2816%2F49%29%29 ALIGN=MIDDLE  ALT=\"highlight%28a=-%2816%2F49%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So then,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=-%2816%2F49%29x%5E2%2B%2816%2F7%29x ALIGN=MIDDLE  ALT=\"y=-%2816%2F49%29x%5E2%2B%2816%2F7%29x\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );