Given the functions $\displaystyle F(x) = 2x^2 - 7$ and $\displaystyle g(x) = 2x + a$, find all values ofasuch that they-interceptof the graph of $\displaystyle (f o g)(x)$ is (0,65)

I understand that (f o g)(x) can be rewritten as f(g(x)) but I have never encountered another variable besides x/y to figure out in this type of question. Can someone help me get started on this one? Thank you.