document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=850451>Question 850451</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Its been a while since I have done functions, so I'm a little confused on this one.<BR>\n" );
document.write( "if f(x)=4x/1-x  and  g(x)=2/x  then f(g(x))=\r<BR>\n" );
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document.write( "the answer is supposed to be 8/x-2 but i got 8/1-x\r<BR>\n" );
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document.write( "I'm also a bit confused on this one as well<BR>\n" );
document.write( "sqrt(a)/1+sqrt(a)=  \r<BR>\n" );
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document.write( "the answer is supposed to be sqrt(a)-a/1-a but I just got 1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #512147 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=512147\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1)if f(x)=4x/1-x and g(x)=2/x then <BR>\n" );
document.write( "f(g(x))= f(2/x) = 4*(2/x) / (1 - 2/x)<BR>\n" );
document.write( "= (8/x) / ((x-2) / x)<BR>\n" );
document.write( "= (8/x) * x / (x-2)<BR>\n" );
document.write( "= 8 / (x - 2)<BR>\n" );
document.write( "2) sqrt(a)/1+sqrt(a)= a^(1/2) / (1 + a^(1/2))<BR>\n" );
document.write( "now multiply the denominator and numerator by (1 - a^(1/2)) and we get<BR>\n" );
document.write( "= (a^(1/2) * (1-a^(1/2)) /  (1 + a^(1/2)) * (1 - a^(1/2))<BR>\n" );
document.write( "= (a^(1/2) - a) / (1 - a)<BR>\n" );
document.write( " </SPAN>\n" );
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