Finding the common denominator
x+2/x^2-49 + 3/x+7
I am sure you mean
(x+2)/(x^2-49) + 3/(x+7) , those brackets are absolutely essential
= (x+2)/( (x+7)(x-7) ) + 3/(x+7)
so what do you think?
hint: what would be the common denominator for
2/((3)(4) ) + 3/4 ?