Solve c

1. Consider the function f: D c 2 -> R xy + 2x f (x, y) = x2 + 4y + 4+y2 a) (2pts) The domain D of f is IR2 except (xo, yo). Find (Xo, yo). b) (4 pts) Find the limit using continuity. Full credit will not be given unless you explain your reasoning. lim f(x, y) (x,y)-(7,42) c) (4pts) Show that the following limit does not exist. lim (x,y)-(0,-2) f (x, y)