Use the theorem on polynomial orders to find an order for n(n 1) 2 + 3n. To answer this question, apply the rules of algebra to the expression n(n 1) 2 + 3n to obtain the following. n(n 1) 2 + 3n = 1 2 n n + 3n = 1 2 n n + 1 2 (6)n = 1 2 n + n