document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=848905>Question 848905</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The first,third and eight term of an arithmetic sequence form the first three terms of a geometric sequence. if the first term is 4. Find the common difference of the arthimetic sequence </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #522269 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=522269\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> an = a + (n - 1)d<BR>\n" );
document.write( "a1 = a <BR>\n" );
document.write( "a3 = a + (2)d<BR>\n" );
document.write( "a8 = a + (7)d<BR>\n" );
document.write( "  <BR>\n" );
document.write( "Geometric <BR>\n" );
document.write( "Tn = t * r^(n - 1)<BR>\n" );
document.write( "a= t <BR>\n" );
document.write( "4 + 2d= 4 * r<BR>\n" );
document.write( "4 + 7d= 4 * r^(2)<BR>\n" );
document.write( "d = 3,   r = 5/2<BR>\n" );
document.write( "or\r<BR>\n" );
document.write( "\n" );
document.write( "d = 0,   r = 1 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );