Posted by **Samantha** on Wednesday, November 5, 2008 at 12:29pm.

4) The graph of y = (x)/(1+25x^2) for x is greater than or equal to 0 has a horizontal tangent at x = what.

So what I did was find the first derivative. I did the quotient rule and ended up with

x50x - 1+25x^2

---------------

(1+25x^2)^2

I equated that with 0 but I don't know how to solve for x without using a calculator. Someone please help.

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