#Edit#: On further thought, I'm a little confused at the answer I got, anyone want to correct me?
Don't take my word for it, but this is what I came up with:
Find e in terms of t using:
b^2 = a^2(e^2-1)
You should find:
e = sqrt(m+8)/sqrt(m)
Using this, you can find the foci using:
Foci =...