# Thread: dirac delta function

1. ## dirac delta function

prove
δ[(x-a)(x-b)]=1/|a-b|

where δ is Dirac delta fuction i need details
can some one help????

2. Originally Posted by doaa
prove
δ[(x-a)(x-b)]=1/|a-b|

where δ is Dirac delta fuction i need details
can some one help????
I think that $\delta (f(x)) = \sum_k \frac{\delta (x-x_k)}{f'(x_k)}$ where $x_k$ are the roots.

3. ## help

ok i used it but it does not work with me
i raised to this:
[δ(x-a)+δ(x-b)]/(a-b)

bbut i dont konw what then

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# dirac delta (x-a)(x-b)dx

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