Factor x squared minus 9?

Step-by-step explanation:

One way to solve the quadratic equation x2 = 9 is to subtract 9 from both sides to get one side equal to 0: x2 - 9 = 0. The expression on the left can be factored: (x + 3) (x - 3) = 0. Using the zero factor property, you know this means x + 3 = 0 or x - 3 = 0, so x = - 3 or 3.