Asked by Ifi
                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).
            
        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).
Answers
                    Answered by
            Steve
            
    Assuming your f' is correct, f is increasing where f'>0.
Since the denominator is always positive, f is increasing where the numerator is positive: x<0
Similarly for decreasing.
    
Since the denominator is always positive, f is increasing where the numerator is positive: x<0
Similarly for decreasing.
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