malawi_glenn

you might want to do the integration starting all over again...

Hint: consider [tex]\int f g^{'} dx = fg - \int f^{'} g dx[/tex]
with
[tex] f(x) = x^{3/2} [/tex]
[tex] g^{'} (x) = e^{-\beta x} [/tex]

you have done the derivative of x^{3/2} wrong...