Adding and Subtracting Rational Expressions? Help?

Question

joel_the_boss · Answer

1.Two fellow students, Theo and Paula, have added two rational expressions. They ended up with different answers, so they have asked you to check their work. Please explain to them any errors that you find.

zzr0ck3r · Answer

do you know what "cross cancelation " is?

joel_the_boss · Answer

Yes!  But sadly I don't know how to do anything with these stupid Rational expressions. Can you explain?

anonymous · Answer

for Theo, at line 3, he can't multiple the numerator by (x+2) at the first term because its denominator has (x+2) already. This is the fault.

anonymous · Answer

for Paula, the  previous line of the last line is totally wrong. We can't cancel on that way.