document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=166613>Question 166613</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help with:\r<BR>\n" );
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document.write( "For f(x)=-2x^5+3x^4-6x^2+1, what does Descartes rule of signs tell you about:\r<BR>\n" );
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document.write( "(a)	the number of positive real zeros?\r<BR>\n" );
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document.write( "(b)	the number of negative real zeros?\r<BR>\n" );
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document.write( "Thank you.\r<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 #122794 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=122794\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Refer to this site for a good explanation:<BR>\n" );
document.write( "http://www.purplemath.com/modules/drofsign.htm<BR>\n" );
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document.write( "f(x)=-2x^5+3x^4-6x^2+1<BR>\n" );
document.write( "There are three sign changes.<BR>\n" );
document.write( "So, 3 or 1 positive roots<BR>\n" );
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document.write( "f(-x)=-2(-x)^5+3(-x)^4-6(-x)^2+1<BR>\n" );
document.write( "f(-x)=2(x)^5+3(x)^4-6(x)^2+1<BR>\n" );
document.write( "There are two sign changes.<BR>\n" );
document.write( "So, 2 or 0 negative roots<BR>\n" );
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