# Homework Help: Calculating Integrals

1. Sep 1, 2009

### rtran58

1. The problem statement, all variables and given/known data
Calculate the integral.
Code (Text):
$$\int\frac{d}{dx}\sqrt{x^{2} + 4}dx$$
2. Relevant equations

3. The attempt at a solution
All i know is that i am suppose to factor out the
Code (Text):
$$\frac{d}{dx}$$
to become
Code (Text):
$$\frac{d}{dx}\int\sqrt{x^{2} + 4}dx$$

2. Sep 1, 2009

### rock.freak667

Here is a hint: Integration is the reverse of differentiation.

There is no factoring out the d/dx

3. Sep 2, 2009

### HallsofIvy

"Fundamental Theorem of Calculus" (which is basically what rock.freak667 said).