Find the following integral (using Substitution method)
`int (2x+5) sqrt(x^2+5x) dx`

Explanation

To solve the integral \( \int (2x + 5) \sqrt{x^2 + 5x} \, dx \) using the substitution method, we can follow these steps:

### Step 1: Choose a substitution
Let \( z = \sqrt{x^2 + 5x} \).

### Step 2: Express \( x^2 + 5x \) in terms of \( z \)
Squaring both sides gives us:
\[
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