document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=942570>Question 942570</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm unsure as to the answer given by BBC bitesize to one of their problems, the problem itself being f(x) = (x-1)/(x+1) find ff(x).<BR>\n" );
document.write( "So I've gotten as far as (-2/(x+1)) * ((x+1)/(2x)) which equates to (according to me) -2x-2/2x^2+2x, now BBC show the answer to be 1/x which I do not get, however I think the answer is 1/x^2 (assuming that -x and x cancel eache other, which I'm also not entirely sure is allowed), so yeah that's my problem...\r<BR>\n" );
document.write( "\n" );
document.write( "(Link to problem: http://www.bbc.co.uk/bitesize/higher/maths/algebra/functions/revision/3/) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #574619 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=574619\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f(x) = (x-1)/(x+1) find fof(x).<BR>\n" );
document.write( "----<BR>\n" );
document.write( "f[f(x)] = f[(x-1)/(x+1)]<BR>\n" );
document.write( "----<BR>\n" );
document.write( "= [(x-1)/(x+1)-1] / [(x-1)/(x+1)+1]<BR>\n" );
document.write( "----<BR>\n" );
document.write( "= [[x-1-(x+1)]/(x+1)] / [[x-1 + (x+1)]/(x+1)]<BR>\n" );
document.write( "----<BR>\n" );
document.write( "= [-2/(x+1)] / [2x/(x+1)]<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "= -2/2x<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "= -1/x<BR>\n" );
document.write( "==============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "------------<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );