document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=955450>Question 955450</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve equation for solution (0 deg, 360 deg)  4 cos ^2 theta +4 cos theta = 1.\r<BR>\n" );
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document.write( "I used the quadratic formula, but get stuck. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #583710 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=583710\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> solve equation for solution (0 deg, 360 deg) 4 cos ^2 theta +4 cos theta = 1<BR>\n" );
document.write( "4cos^2(x)+4cosx=1<BR>\n" );
document.write( "4cos^2(x)+4cosx-1=0<BR>\n" );
document.write( "solve for cosx by quadratic formula:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cosx+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"cosx+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a=4, b=4, c=-1<BR>\n" );
document.write( "ans:<BR>\n" );
document.write( "cosx=-1.207 (reject)(-1 &#8804; cosx &#8804;1)<BR>\n" );
document.write( "or<BR>\n" );
document.write( "cosx=0.207<BR>\n" );
document.write( "x&#8776;78.05&#730;, 281.95&#730; </SPAN>\n" );
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