document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1100471>Question 1100471</A>: <I><SPAN STYLE=\"word-break: break-all;\"> you use a system with three variables to find the equation of a parabola that passes through the points (-8,0) (2,-20) and (1,0). Your friend uses intercept form to find the equation. whose method is easier? justify your answer. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #714961 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=714961\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Trying \"intercept form\",\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=a%28x-r%29%28x-s%29 ALIGN=MIDDLE  ALT=\"y=a%28x-r%29%28x-s%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > for roots or zeros r and s,\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%28x%2B8%29%28x-1%29=0 ALIGN=MIDDLE  ALT=\"a%28x%2B8%29%28x-1%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" >, according to the two given roots.\r<BR>\n" );
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document.write( "The other given point:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%28x%2B8%29%28x-1%29=y ALIGN=MIDDLE  ALT=\"a%28x%2B8%29%28x-1%29=y\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%282%2B8%29%282-1%29=-20 ALIGN=MIDDLE  ALT=\"a%282%2B8%29%282-1%29=-20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2A10%2A1=-20 ALIGN=MIDDLE  ALT=\"a%2A10%2A1=-20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10a=-20 ALIGN=MIDDLE  ALT=\"10a=-20\"   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=-2%29 ALIGN=MIDDLE  ALT=\"highlight%28a=-2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The equation for the three given points is  therefore <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=-2%28x%2B8%29%28x-1%29%29 ALIGN=MIDDLE  ALT=\"highlight%28y=-2%28x%2B8%29%28x-1%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "You can decide for yourself if using the intercept method is better and discuss it.  We only needed to handle two equations using the intercept form. </SPAN>\n" );
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