document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1179963>Question 1179963</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Find explicit formulas for sequences with the initial terms given:1) 0, 1, -2, 3, -4, 5,  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #809517 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=809517\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Ignoring the alternating signs for the moment...<br><BR>\n" );
document.write( "term #1 is 0<BR>\n" );
document.write( "term #2 is 1<BR>\n" );
document.write( "term #3 is 2<BR>\n" );
document.write( "term #4 is 3<BR>\n" );
document.write( "...<BR>\n" );
document.write( "term #n is (n-1)<br><BR>\n" );
document.write( "To get the alternating signs, add a factor of (-1)^n or (-1)^(n-1) to the formula.  Since the even-numbered terms are positive, we need a factor of (-1)^n.<br><BR>\n" );
document.write( "ANSWER: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%28n%29+=+%28%28-1%29%5En%29%28n-1%29 ALIGN=MIDDLE  ALT=\"t%28n%29+=+%28%28-1%29%5En%29%28n-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );