- #1

DERRAN

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## Homework Statement

Find f

^{'}(x)= 16x - x

^{-2}using first principles.

## Homework Equations

x

http://img153.imageshack.us/img153/8403/597137697c1f605c7a43d34qz4.png

## The Attempt at a Solution

I used dy/dx and got 2x

^{-3}+ 16 but I get something different when I use the formula I attempted several times and I can't get the same answer as the dy/dx.

Please need help!

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