document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1186229>Question 1186229</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the equation of the inverse for each function. State which of the following inverses are functions.<BR>\n" );
document.write( "a. f(x) = 1/(2 x) - 3\r<BR>\n" );
document.write( "\n" );
document.write( "b. f(x) = 4x 2 - 5\r<BR>\n" );
document.write( "\n" );
document.write( "c. A(r) = 4(Pi)r^2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #817221 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=817221\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y=1/(2x)-3<BR>\n" );
document.write( "x=(1/(2y)-3<BR>\n" );
document.write( "x+3=1/2y<BR>\n" );
document.write( "y=(1/2(x+3)) or 1/(2x+6)<BR>\n" );
document.write( "That is a function.<BR>\n" );
document.write( "-<BR>\n" );
document.write( "y=4x^2-5<BR>\n" );
document.write( "x=4y^2-5<BR>\n" );
document.write( "4y^2=x+5<BR>\n" );
document.write( "y^2=(1/4)(x+5). Not a function <BR>\n" );
document.write( "-<BR>\n" );
document.write( "a=4pir^2<BR>\n" );
document.write( "r=4 pi a^2<BR>\n" );
document.write( "a^2=r/4 pi,<BR>\n" );
document.write( "Area=sqrt(r/4 pi). A function with restricted domain\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );