Find the derivative.

Generally that require a little effort. "find" really is a bad word for that. It isn't hiding under a rock. You have to demonstrate what you have learned.

What do you get?
 
There, see, you are REALLY close.

The first term is correct.
The second term has the wrong sign.
The third term went the wrong direction.
 
-3/x^3/2 + 4/x^2 -16/x^5

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