Have a question im not to sure about, hopefully im in the right section.

d^2M/dt^2 =2delta(t-3)-2delta(t-6)

M=3 and dM/dt = 0 when t=0

I have to determine and sketch the function

So far i've took the lapace

s^2M-3M =2e^-3s - 2e^-6s is this right??

any pointers on what to do next