Problem 5 (10 points) 5a. (correct identification of function with reason 1 point, correct identification of function type with reason 2 points, range 1 point. Counter-example 5 point). Do either Sali) or 5a(ii). Tell whether the defined function is a function or not a function and what type of function: injective, surjective or bijective. Also derive the range of the function. Explain the reason for your answer. (1) Domain: (1,2,4,7,8) Codomain= {4,9,25,64, 81} f(n) = n2 + 2n +1 OR (ii) Domain R (real number domain) zt (domain of integers) f(n) = n2/5] - 4