document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=87620>Question 87620</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I would appreciate any help walking me through this homework question that I have.<BR>\n" );
document.write( "Find all real zeros of the functions listed below.<BR>\n" );
document.write( "*   f(x)=-7x^4+343x^2<BR>\n" );
document.write( "*   f(x)=x^4-16x^2+15 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #63561 by </B><A HREF=/tutors/aboutme.mpl?userid=longjonsilver><B>longjonsilver(2297)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=longjonsilver><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=longjonsilver><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=63561\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f%28x%29=-7x%5E4%2B343x%5E2+ ALIGN=MIDDLE  ALT=\"+f%28x%29=-7x%5E4%2B343x%5E2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f%28x%29=-7x%5E2%28x%5E2-49%29+ ALIGN=MIDDLE  ALT=\"+f%28x%29=-7x%5E2%28x%5E2-49%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+f%28x%29=-7x%5E2%28x%2B7%29%28x-7%29+ ALIGN=MIDDLE  ALT=\"+f%28x%29=-7x%5E2%28x%2B7%29%28x-7%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "2. think of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E4-16x%5E2%2B15+ ALIGN=MIDDLE  ALT=\"+x%5E4-16x%5E2%2B15+\"   DISABLED_style= \"max-width:90%; height:auto;\" > as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y%5E2-16y%2B15+ ALIGN=MIDDLE  ALT=\"+y%5E2-16y%2B15+\"   DISABLED_style= \"max-width:90%; height:auto;\" > where <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=x%5E2 ALIGN=MIDDLE  ALT=\"y=x%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >. You can factorise this quadratic in y by looking and then re-write y as x^2 for each solution and find out what x is for each.\r<BR>\n" );
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document.write( "cheers<BR>\n" );
document.write( "Jon<BR>\n" );
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