Hello, I have a question I am not sure how to fully solve.

F(x) = 4e^-x^2; Find F''(3)

so I take the first derivative which is = -8xe^-x^2

now to take the 2nd derivative I would use the product rule with -8x * e^-x^2 and I got 16xe^2e^(-x)^*2 * -8e^(-x)^2

clearly, this does not seem to be correct because if I plug in 3 it would be an extremely small/large number.