# Homework Help: Dirac delta function evaluation

1. Nov 9, 2009

### vwishndaetr

I do not know how to execute the problem with the 2x in the problem.

Evaluate the integral:

$$\int_{-4}^{4} (x^2+2x+1) \delta(2x) dx$$

2. Nov 9, 2009

### clamtrox

Simplest way would be to change variables. Write 2x = y, and you know what integral over $$\delta(y)$$ gives right?

3. Nov 9, 2009

### vwishndaetr

Yup i got it. Thanks.