Please do Case 2 if possible

Prove the following statement by cases: for any integer n, show that n2+9n1 is odd. Part 1 Part 2 We will consider two cases: n is even and n is odd. In this step, you will complete the proof of the first case. Proof. Case 1: n is even Let n be an even integer. By the definition of even, for some integer k. This follows that n2+9n1=211+1. Since is an integer, must be an integer. Since n2+9n1 equals times an integer plus n2+9n1 is