Find f.. f. f.(- 1,3), and f (7. - 4) for the following equation fxy) =X-M 2 (Type an exact answer, using radicals as needed.) fv = (Type an exact answer, using radicals as needed.) fx( - 1,3) = (Type an exact answer, using radicals as needed.) fy(7. - 4) = (Type an exact answer, using radicals as needed.)