Adding Fractions Help

[Shmuco]

Hello, Im new here so forgive me if post this on the wrong place.

Attached are 3 questions that I'm trying to figure out and for the life of me I can't get to the right answer. I think I'm missing something.


Any help would be appreciated

 

[lev888]

1 - where did the denominator go?
2 - you need to review how to deal with signs in these type of exercises

 

[JeffM]

In the first sum, you do not have (m + 3) as the denominator in the second fraction, but (m + 3)(m + 3). You will need to multiply both the first fraction and the third by (m + 3)/(m + 3) to get that term into their denominators.

 

[lev888]

3 - another sign related error. Don't skip intermediate steps, write everything down.
4 - looks ok to me.