gregoryrose5 gregoryrose5

20-03-2018
Mathematics

contestada

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

Respuesta :

calculista calculista

29-03-2018

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)]

Answer Link

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