Answer:
To find the value of the expression using the formula a² - b², where a = 2 and b = 2, we substitute the given values into the formula and simplify:
a² - b² = (2)² - (2)²
Simplifying further:
= 4 - 4
= 0
Therefore, when a = 2 and b = 2, the value of the expression a² - b² is 0.
Note: The formula a² - b² is known as the difference of squares formula. It states that the difference between the squares of two numbers, a and b, can be expressed as the product of their sum and their difference. In this case, since a = b = 2, the expression simplifies to 2² - 2² = 4 - 4 = 0.