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what are the critical numbers of f(x)= 4x/(x^2 +1)?

Calculus1
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did u already calculate the derivative?
what's f ' (x) = ??
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Other answers:

do i simplify it further or just set it to 0 now?
to simplify makes setting it = to 0 much easier
ok i need help simplifying it…i don't think i am doing it right so far
k also the critical points are what makes the top part become 0 .. or what makes the bottom part not exist.. in this case all reals exist on the domain... so we just gotta worry bout setting the top = to 0
so i just completely forget the bottom part?
|dw:1358921549240:dw|
i wouldnt say forget bout the bottom part... but usually in the 1st derivative test its worthless.. unless theres a square root or something that might make it non existiant
hmm let me think... i gotta make sure i didnt say soemthing wrong
|dw:1358921732409:dw|
wait wait that was wrong i got it its 1
k i also need to add that critical points are when the derivative = 0 on the bottom or top.. and when its undefined... but it must all be in the domain
We say that x=c is a critical point of the function f(x) if exists and if either of the following are true. f'(c)=0 or doesnt exist
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but ultimately the 1 and -1 are the critical points... sorry i kinda am lost in calculus *been a while since i did it* but making the top = to 0 and finding where stuff doesnt exist is where critical points are.... srry if i say something wrong but this info should be correct
thanks for the help!

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