document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=127609>Question 127609</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0495012661/algebrahomeworkh>College Algebra </A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> b^2/b^2-4 - 4/b^2-2b<BR>\n" );
document.write( "I know you have to find the common denominators by factoring the denominators so it ends up being:<BR>\n" );
document.write( "b^2/(b-2)(b+2) - 4/(b-2)(b+b) but after that step, I don't know what to do and which numbers to pick to get the same denominator. </SPAN>\n" );
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document.write( "First of all you have a mistake<BR>\n" );
document.write( "b^2/b^2-4 - 4/b^2-2b  =b^2/(b-2)(b+2) - 4/(b-2)(b)\r<BR>\n" );
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document.write( "the denominators are (b-2)(b+2) and (b-2)(b) to find the common denominator<BR>\n" );
document.write( "you have to select (b-2) (because is in both denominators) and (b+2) and (b)\r<BR>\n" );
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document.write( "so the common denominator is (b-2)(b+2)b </SPAN>\n" );
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