Consider a CES production function given by Q

Q2.  Text -  B& B, 5^th ed. Problem #6.24

Consider a CES production function given by Q = (K^0.5+ L^0.5)².

a)      Does this production function exhibit increasing, decreasing, or constant returns to scale?

b)      Suppose that the production function took the form Q = (100 + K^0.5+ L^0.5)². Does this production function exhibit increasing, decreasing, or constant returns to scale?