i am asked to find the greens function for

U' +kU=f(x)

with u(0)=0 and x>=0

i found the homogenous solution and used the 4 conditions...

my homogen soln was u=constant * exp(-kU)....

is it possible that my G(x,s)= 0 for x<s and X>s?

also how do i show that -u"= f(x) is not self adjoint with bc

u(0)=0 and u'(0) +u(1)=0

i have the greens function but the bc's dont hold for it?

is that right?