Question

Find the sum 4/x^2-9+7/x+3

Answer 1

its b

Explanation:

(x-3) (x+3) is the bottom half

Answer 2

we have that
(4/(x²-9))+(7/(x+3))
(x²-9)-------------> (x+3)*(x-3)
then
4/[(x+3)*(x-3)]+7/[x+3]

step 1
find the LCD first and then combine

[4+7*(x-3)]/[(x+3)*(x-3)]-------> [4+7x-21]/[(x+3)*(x-3)]
=[7x-17]/[(x+3)*(x-3)]

the answer is
[7x-17]/[(x+3)*(x-3)]