document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1013018>Question 1013018</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find four roots of the following equation:\r<BR>\n" );
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document.write( "2x^4 +5x^2 = 207\r<BR>\n" );
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document.write( "* I plugged into my calculator and only got 2 roots, x=-3 and x=3, but how do you get the rest? Thanks :) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #629173 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=629173\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "Let y=x^2<BR>\n" );
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document.write( "2x^4+5x^2=207 . Replace x^2 with y.<BR>\n" );
document.write( "2y^2+5y-207=0<BR>\n" );
document.write( "(y-9)(2y+23)=0<BR>\n" );
document.write( "y-9=0 . or . 2y+23=0<BR>\n" );
document.write( "y=9 . or . 2y=-23<BR>\n" );
document.write( "y=9 . or . y=-23/2 . Replace y with x^2<BR>\n" );
document.write( "x^2=9 . or . x^2=-23/2<BR>\n" );
document.write( "x=+/- 3 . or x=+/-<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2823%2F2%29 ALIGN=MIDDLE  ALT=\"sqrt%2823%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >i=+/-<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sqrt%2846%29%2F2%29i ALIGN=MIDDLE  ALT=\"%28sqrt%2846%29%2F2%29i\"   DISABLED_style= \"max-width:90%; height:auto;\" >  \r<BR>\n" );
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document.write( " </SPAN>\n" );
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