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

User Atconway
by
8.3k points

2 Answers

4 votes

Answer:

its b

Explanation:

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

User Jnosek
by
7.9k points
2 votes
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)]

User Ezequiel Jadib
by
9.0k points
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