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The expression \(X^2 - 16\) is a difference of squares. The difference of squares can be factored using the formula:

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

In this case, \(X^2\) is \(a^2\) and \(16\) is \(b^2\). So we can identify \(a = X\) and \(b = 4\) because \(4^2 = 16\).

Applying the difference of squares formula, we get:

\[
X^2 - 16 = (X + 4)(X - 4)
\]

Thus, the factors of the expression \(X^2 - 16\) are:

\[
\boxed{\text{A. } (X + 4)(X - 4)}
\]

Do you want details or have any questions? Here are five more questions you might ask:

1. How do you factor expressions using the difference of squares formula?
2. What are other common factoring formulas for polynomials?
3. How do you factor trinomials of the form \(ax^2 + bx + c\)?
4. What is the process for factoring by grouping?
5. How can you verify that your factored form of a polynomial is correct?

**Tip:** When factoring polynomials, always check if the expression can be written as a difference of squares, a perfect square trinomial, or if common factors can be factored out first.

Learn how to factor the expression X^2 - 16 using the difference of squares formula with a detailed step-by-step solution. This problem covers key algebraic concepts, including factoring polynomials and the difference of squares formula. Suitable for students in Grades 9-12.

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