Question: Which of the following is the expanded form of (x - 7)(x + 7)?

Options:

1. x² - 49
2. x² + 49
3. x² - 14x + 49
4. x² + 14x - 49

Correct Answer: x² - 49

Solution:

(x - 7)(x + 7) = x² - 49, a difference of squares.