Dirac delta function evaluation

[vwishndaetr]

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

Evaluate the integral:

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

 

[clamtrox]

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

 

[vwishndaetr]

Yup i got it. Thanks.