Question: What is the value of (x + 1)^2 - (x - 1)^2?

Options:

1. 4
2. 2x
3. 0
4. 2

Correct Answer: 4

Solution:

Using the difference of squares identity, (a + b)^2 - (a - b)^2 = 4b, we have (x + 1)^2 - (x - 1)^2 = 4(1) = 4.