Question

http://prntscr.com/b7ox4a

Answer 1

when you add a fraction and you have something like this:

4 2
---- - ------
7 7

Answer 2

how would you solve that ?

Answer 3

2/7

Answer 4

ok, do the same thing on the problem you have, the common denominator is a^2-4

Answer 5

just subtract the top and you have 4a + 1 -(2a+7)

Answer 6

4a+1-2a-7

Answer 7

combine like terms

Answer 8

your answer is correct, because it cannot be simplified any more