Learn how to factor the difference of two squares

The video tutorial covers solving a math problem using the difference of squares formula. The teacher introduces the problem, explains the formula a^2 - b^2 = (a + b)(a - b), and guides students on identifying the variables a and b. The expression is then rewritten to demonstrate the application of the formula.

What example is given to illustrate the difference of squares?

What does the teacher mean by rewriting the expression as r squared minus 2 squared?