document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1090588>Question 1090588</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello,\r<BR>\n" );
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document.write( "I would like to know if it's possible to calculate the equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2Ax%5E2-b%2Ax-c ALIGN=MIDDLE  ALT=\"a%2Ax%5E2-b%2Ax-c\"   DISABLED_style= \"max-width:90%; height:auto;\" > of a parabola from more than 3 coordinates (x;y).\r<BR>\n" );
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document.write( "I have done the equation for 3 coordinates:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a+=+%28%28y1+-+y2%29%2A%28x2+-+x3%29+-+%28y2+-+y3%29%2A%28x1+-+x2%29%29+%2F+%28%28x1%5E2+-+x2%5E2%29%2A%28x2+-+x3%29+-+%28x2%5E2+-+x3%5E2%29%2A%28x1+-+x2%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b+=+%28%28y1+-+y2%29+-+a%2A%28x1%5E2+-+x2%5E2%29%29+%2F+%28x1+-+x2%29 ALIGN=MIDDLE  ALT=\"b+=+%28%28y1+-+y2%29+-+a%2A%28x1%5E2+-+x2%5E2%29%29+%2F+%28x1+-+x2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c+=+y1+-+a%2Ax1%5E2+-+b%2Ax1 ALIGN=MIDDLE  ALT=\"c+=+y1+-+a%2Ax1%5E2+-+b%2Ax1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Thanks in advance </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #705073 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=705073\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I would like to know if it's possible to calculate the equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2Ax%5E2-b%2Ax-c ALIGN=MIDDLE  ALT=\"a%2Ax%5E2-b%2Ax-c\"   DISABLED_style= \"max-width:90%; height:auto;\" > of a parabola from more than 3 coordinates (x;y).<BR>\n" );
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document.write( "If it's known to be a parabola, 3 points define it.<BR>\n" );
document.write( "The 4th point may not be on the parabola.<BR>\n" );
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document.write( "If all 4 points are on it, use any 3 of them.<BR>\n" );
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document.write( "A similar question:<BR>\n" );
document.write( "Can you use 3 (or more) points to find the equation of a straight line? </SPAN>\n" );
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