document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=167316>Question 167316</A>: <I><SPAN STYLE=\"word-break: break-all;\"> sqrtof 9x+81=x+5\r<BR>\n" );
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document.write( "not sure how to solve...please help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #123258 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=123258\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%289x%2B81%29 ALIGN=MIDDLE  ALT=\"sqrt%289x%2B81%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = x + 5<BR>\n" );
document.write( "Square both sides:<BR>\n" );
document.write( "9x + 81 = (x + 5)^2<BR>\n" );
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document.write( "FOIL the right side<BR>\n" );
document.write( "9x + 81 = x^2 + 10x + 25<BR>\n" );
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document.write( "0 = x^2 + 10x - 9x + 25 - 81<BR>\n" );
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document.write( "A quadratic equation:<BR>\n" );
document.write( "x^2 + x - 56 = 0<BR>\n" );
document.write( "Factors to:<BR>\n" );
document.write( "(x+8)(x-7) = 0<BR>\n" );
document.write( "Two solutions<BR>\n" );
document.write( "x = -8<BR>\n" );
document.write( "and <BR>\n" );
document.write( "x = 7<BR>\n" );
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document.write( "Both solutions have to be checked in the original equation:<BR>\n" );
document.write( "x= -8<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%289%28-8%29%2B81%29 ALIGN=MIDDLE  ALT=\"sqrt%289%28-8%29%2B81%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -8 + 5<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28-72%2B81%29 ALIGN=MIDDLE  ALT=\"sqrt%28-72%2B81%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -8 + 5<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%289%29 ALIGN=MIDDLE  ALT=\"sqrt%289%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -3<BR>\n" );
document.write( "3 does not = -3; x = -8 is not a solution<BR>\n" );
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document.write( "x=+7<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%289%287%29%2B81%29 ALIGN=MIDDLE  ALT=\"sqrt%289%287%29%2B81%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 7 + 5<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2863%2B81%29 ALIGN=MIDDLE  ALT=\"sqrt%2863%2B81%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 12<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28144%29 ALIGN=MIDDLE  ALT=\"sqrt%28144%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 12<BR>\n" );
document.write( "12 = 12; x=7 is good solution<BR>\n" );
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