document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=187842>Question 187842</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve y^4-4y^2+4=0(hint: set x=y^2 solve for x, then solve for y after finding x)\r<BR>\n" );
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document.write( "this makes no sense to me, i feel like it isn't a problem i've learned about </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #140832 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=140832\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> solve y^4-4y^2+4=0(hint: set x=y^2 solve for x, then solve for y after finding x) <BR>\n" );
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document.write( "Sub x for y^2<BR>\n" );
document.write( "x^2 - 4x + 4 = 0<BR>\n" );
document.write( "(x-2)*(x-2) = 0<BR>\n" );
document.write( "x = 2<BR>\n" );
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document.write( "y^2 = 2<BR>\n" );
document.write( "y = +sqrt(2)<BR>\n" );
document.write( "y = -sqrt(2)<BR>\n" );
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