document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=21838>Question 21838</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I think i did this problem right, but it still seems wrong.<BR>\n" );
document.write( "Question: 7a/15b^2 + b/18ab<BR>\n" );
document.write( "What I have done: 42a^2/90ab^2+ 5b^2/90ab^2<BR>\n" );
document.write( "                  =47a^2b^2/90ab^2=47a/90<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #11960 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=11960\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> When you have the common denominator of 90ab^2 as the <BR>\n" );
document.write( "denominator of your two fractions (which you did <BR>\n" );
document.write( "correctly)  your next step is to add the numerators<BR>\n" );
document.write( "of the two fractions and write that sum over the common<BR>\n" );
document.write( "denominator, as follows:\r<BR>\n" );
document.write( "\n" );
document.write( "   [42a^2+5b^2)/[90ab^2]<BR>\n" );
document.write( "That is as far as you can go because you have on<BR>\n" );
document.write( "\"like\" terms in the numerator and no common factor.<BR>\n" );
document.write( "You cannot add the 42 and the 5 because the terms<BR>\n" );
document.write( "are not \"like\"---it is like 42 apples and 5 oranges,<BR>\n" );
document.write( "which cannot be added.\r<BR>\n" );
document.write( "\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );