document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=678117>Question 678117</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve fo x.\r<BR>\n" );
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document.write( "X^4+61x^2+900=0<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #421199 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=421199\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve for x.\r<BR>\n" );
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document.write( "X^4+61x^2+900=0<BR>\n" );
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document.write( "Let u=x^2<BR>\n" );
document.write( "u^2 + 61u + 900 = 0<BR>\n" );
document.write( "This can be factored as (u+36)(u+25) = 0<BR>\n" );
document.write( "The solutions are u=-36, u=-25<BR>\n" );
document.write( "x^2 = -36 -> x = 6i, -6i<BR>\n" );
document.write( "x^2 = -25 -> x = 5i, -5i </SPAN>\n" );
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