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# Differentiate watch

1. 1/sqrt(x) +2

I got
-0.5sqrt(x) / (sqrt(x)+2)^2

However in the book it's
-1/(2sqrt(x) (sqrt(x)+2)^2)
2. (Original post by Liampayneisapain)
1/sqrt(x) +2

I got
-0.5sqrt(x) / (sqrt(x)+2)^2

However in the book it's
-1/(2sqrt(x) (sqrt(x)+2)^2)
Let and let
3. (Original post by Liampayneisapain)
1/sqrt(x) +2

I got
-0.5sqrt(x) / (sqrt(x)+2)^2

However in the book it's
-1/(2sqrt(x) (sqrt(x)+2)^2)
The book is correct

If you can't spot your error, post your working and i'm sure someone will point it out. I suspect its in your application of the chain rule.

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Updated: January 21, 2017
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