Can someone me with this question?

Finding the sol'n to f(x) - g(x) = 0 is the same as finding the solution of f(x)=g(x).  You could do this analytically by setting the actual function f(x) = g(x) and solving for x (and then for y), or you could estimate the solution from the given graph.  The two lines intersect at approx. x=-3.75, y=2.5.