2. Use the definition of continuity and properties of limits to show that the function is continuous at the given interval f(x) = xV16 -x2, [-4,4] 3. Explain why the function is discontinuous at the given number, sketch the graph of the function a) f (x ) = x2-1 a=-1 x+1 x2. 1 if x # -1 b) f (x ) = x+1 a =-1 6, if x = -1 1 c) f (x ) = x-1 ' if x # 1 a = 1 2, if x = 1