Final answer:
To factor the expression x²-25, use the difference of squares formula: (x + 5)(x - 5).
Step-by-step explanation:
To factor the expression x²-25, we can use the difference of squares formula, which states that a² - b² = (a + b)(a - b).
In this case, a = x and b = 5. So, we can rewrite the expression as x² - 5².
Applying the formula, we get (x + 5)(x - 5).