N (n-1) + 3 (n-1) Factor the polynomial

The properly factored form of this would be (n + 3) (n - 1)

Step-by-step explanation:

When you have two terms being multiplied by the same polynomial, you can combine those terms into a polynomial of their own. So since n and 3 were both being multiplied by (n - 1), we can put them in the same parenthesis and multiply them with the parenthesis given.