- #1

Ris Valdez

- 9

- 0

## Homework Statement

Find f ' (x) if f(x) = 4x + 4 / x

^{2}+ 4

## Homework Equations

I used the mnemonic "lo

**d**hi - hi

**d**lo / (lo)^2

## The Attempt at a Solution

I got -4x^2 +16-8x / (x^2+4)^2

but it's telling me I'm wrong? Why? I computed it again but I still got the same answer.