# Problem of the Week

## Updated at Apr 20, 2015 3:09 PM

To get more practice in calculus, we brought you this problem of the week:

How can we find the derivative of $$7x-\sqrt{x}$$?

Check out the solution below!

$\frac{d}{dx} 7x-\sqrt{x}$

 1 Use Power Rule: $$\frac{d}{dx} {x}^{n}=n{x}^{n-1}$$.$7-\frac{1}{2\sqrt{x}}$Done7-1/(2*sqrt(x))