document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=2172>Question 2172</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please please please what is \r<BR>\n" );
document.write( "\n" );
document.write( "logx81=4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #859 by </B><A HREF=/tutors/aboutme.mpl?userid=vms><B>vms(2)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vms><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=859\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> logx81=4\r<BR>\n" );
document.write( "\n" );
document.write( "we know logxa=k if a= x^k \r<BR>\n" );
document.write( "\n" );
document.write( "that means ...<BR>\n" );
document.write( "if 'a' can be written as k th power of x then we say k is logarithm of a to base x.\r<BR>\n" );
document.write( "\n" );
document.write( "as we see 3 = 3^1<BR>\n" );
document.write( "9=3^2<BR>\n" );
document.write( "27=3^3<BR>\n" );
document.write( "81=3^4\r<BR>\n" );
document.write( "\n" );
document.write( "which shows 81 can be got as 4th power of 3.  so, logx81=4 implies x=3 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );