(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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

2. Relevant equations

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

3. 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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