document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=111755>Question 111755</A>: <I><SPAN STYLE=\"word-break: break-all;\"> when I entered this into my calculator it said error<BR>\n" );
document.write( "ln x = -1.384 rounded to 3 significant digits. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #81540 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=81540\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You probably entered <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%28-1.384%29 ALIGN=MIDDLE  ALT=\"ln%28-1.384%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > which is undefined. Remember <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%28x%29=y ALIGN=MIDDLE  ALT=\"ln%28x%29=y\"   DISABLED_style= \"max-width:90%; height:auto;\" > can be written as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=e%5Ey=x ALIGN=MIDDLE  ALT=\"e%5Ey=x\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Now if x=-1.384, then\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=e%5Ey=-1.384 ALIGN=MIDDLE  ALT=\"e%5Ey=-1.384\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Now what number will make e (which is 2.78) go to -1.384? It turns out this is not possible, so there is no such number that will satisfy this equation. So at that point, the equation is undefined.\r<BR>\n" );
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document.write( "However, if we try to solve   ln x = -1.384  (which is not what you typed in), then we can say\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=e%5E%28-1.384%29=0.250574248795 ALIGN=MIDDLE  ALT=\"e%5E%28-1.384%29=0.250574248795\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "So <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=0.250574248795 ALIGN=MIDDLE  ALT=\"x=0.250574248795\"   DISABLED_style= \"max-width:90%; height:auto;\" > which is approximate of course </SPAN>\n" );
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