document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=302036>Question 302036</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Sorry if this isn't the right topic.... this is from an accuplacer practice test.  I know the answer is 11z-20 over z(z-5) but don't understand how to work it.  Here's the problem: 4/z plus 7/z-5 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #216573 by </B><A HREF=/tutors/aboutme.mpl?userid=london+maths+tutor><B>london maths tutor(243)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=london+maths+tutor><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=london+maths+tutor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=216573\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 4/z plus 7/z-5\r<BR>\n" );
document.write( "\n" );
document.write( "you need to obtain common denominator before adding the numerator.\r<BR>\n" );
document.write( "\n" );
document.write( "the denominator = z(z-5) <BR>\n" );
document.write( "but remember to multiply the same factor to the numerator too i.e\r<BR>\n" );
document.write( "\n" );
document.write( "4/z = [4*(z-5)]/[z*(z-5)]<BR>\n" );
document.write( "7/z-5 = [7*z /(z*(z-5))]\r<BR>\n" );
document.write( "\n" );
document.write( "So the sum becomes:\r<BR>\n" );
document.write( "\n" );
document.write( "[4*(z-5) + 7*z] / [z(z-5)]\r<BR>\n" );
document.write( "\n" );
document.write( "[4z - 20 + 7z] / [z(z-5)]\r<BR>\n" );
document.write( "\n" );
document.write( "(11z-20)/z(z-5) (hence shown)  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );