Question: What is the factored form of x^2 - 9?

Options:

1. (x - 3)(x + 3)
2. (x - 9)(x + 1)
3. (x - 1)(x + 1)
4. (x + 3)(x + 3)

Correct Answer: (x - 3)(x + 3)

Solution:

This is a difference of squares: x^2 - 9 = (x - 3)(x + 3).