document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=255121>Question 255121</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solving Equation by Factoring <BR>\n" );
document.write( "(zero property)<BR>\n" );
document.write( "Solve:<BR>\n" );
document.write( "25x^2-90x=-81 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #187430 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=187430\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve:<BR>\n" );
document.write( "25x^2 -90x = -81<BR>\n" );
document.write( ";<BR>\n" );
document.write( "add 81 to each side<BR>\n" );
document.write( "25x^2 - 90x  + 81 = 0<BR>\n" );
document.write( ":<BR>\n" );
document.write( "This looks like a perfect square (25 * 81)<BR>\n" );
document.write( "(5x - 9)(5x - 9) = 0<BR>\n" );
document.write( ":<BR>\n" );
document.write( "5x = 9<BR>\n" );
document.write( "x = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9%2F5 ALIGN=MIDDLE  ALT=\"9%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ";<BR>\n" );
document.write( "Check by FOILing the factors:<BR>\n" );
document.write( "25x^2 - 45x - 45x + 81 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );