The expression \((a + b)(a - b)\) is a product of two binomials. This is a difference of squares formula, which can be expanded as:

\[
(a + b)(a - b) = a^2 - b^2
\]

### Explanation:
- The product of the sum and difference of the same two terms \(a\) and \(b\) results in the difference between their squares.
- In this case:
  - \(a \times a = a^2\)
  - \(-b \times b = -b^2\)

Thus, \((a + b)(a - b)\) simplifies to \(a^2 - b^2\).

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### Related Questions:
1. How do you apply the difference of squares formula to \((x + 3)(x - 3)\)?
2. What is the result of \((2a + 3b)(2a - 3b)\)?
3. How does the difference of squares relate to factoring quadratic expressions?
4. Can you solve the equation \((a + b)(a - b) = 0\) for \(a\) and \(b\)?
5. How does the difference of squares apply to complex numbers?

### Tip:
When recognizing patterns in algebraic expressions, such as the difference of squares, it becomes easier to factor or expand them quickly.

Explore the algebraic expression (a + b)(a - b) and understand how it simplifies using the difference of squares formula. This page provides a step-by-step explanation, covering key concepts in algebra. Suitable for high school students.

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