Posted by **Ifi** on Sunday, October 28, 2012 at 3:43am.

find the intervals of increase and decrease of f(x)=3/(x*2+11) -1 ?

My f'(x) is-6x/(x^2+1)^2, after that i didn't know how to proceed next bcus i didn't know how to find x to substitute in the f'(x).

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