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## Homework Statement

(16x)/(x^2+4) for -5 (less than OR equal to) x (less than OR equal to) 5

## Homework Equations

Set the derivative of the equation equal to 0, solve for x to find the critical points, then plug and check for validity.

## The Attempt at a Solution

I used product rule for (16x)*(x^2+4)^-1

I got the derivative as

(-32x^2)/((x^2+4)^2) + (16/(x^2+4))

which I then set equal to 0.

I then made an attempt to solve for x, but got x^2(48x^2+256)=-256, which I'm very unsure of, and am also not sure how to solve.

Help is appreciated.

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