It might prove helpful to put the terms in descending order before doing the simplification:
Ha, of course! I believe that's why 'Doh!' was invented!
Note: If the negation sign is, as you have posted, in front of the entire expression, then the sign between the two terms in the numerator should be additive, not subtractive.
Yes. I couldn't even copy the answer down correctly!
so that leaves me with:
My next question is how and (more importantly) WHY should it be changed to
If I multiply by -1 won't this also change the signs of the denominator? This always confuses me!