document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=173150>Question 173150</A>: <I><SPAN STYLE=\"word-break: break-all;\"> f(x)=2x-7 and f^-1(x)= x+7/2, find f(f^-1(x)) if it exists. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #127998 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=127998\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  f(x)=2x-7 and f^-1(x)= (x+7)/2, find f(f^-1(x)) if it exists.<BR>\n" );
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document.write( "f(f^-1(x)) = f[(x+7)/2] = 2[(x+7)/2]-7 = x+7-7 = x<BR>\n" );
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document.write( "Notice how f undoes what f^-1 does.<BR>\n" );
document.write( "Similarly f^-1(x) undoes what f does.<BR>\n" );
document.write( "That is what \"inverse\" means.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H<BR>\n" );
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