f(x)= x/(5x^2+5) I found f''(x) which is required to solve for x, but I still get the answer wrong on my online hw. what i got for: f''(x)=-10x/(5x^2+5)^2
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Originally Posted by Asuhuman18 f(x)= x/(5x^2+5) I found f''(x) which is required to solve for x, but I still get the answer wrong on my online hw. what i got for: f''(x)=-10x/(5x^2+5)^2 Try again on the derivative. The second derivative should be: $\displaystyle f''(x)=\frac{2x(x^2-3)}{5(x^2+1)^3}$
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