2. find f(1), f(2), f(3), f(4), and f(5) if f(n) is defined re- cursively by f(0) = 3 and for n = 0, 1, 2, … a) f(n + 1) = −2f(n). b) f(n + 1) = 3f(n) + 7. c) f(n + 1) = f(n)2 − 2f(n) − 2. d) f(n + 1) = 3f(n)∕3.