First, recognize that the expression can be rewritten by grouping terms. The first part forms a perfect square, and the remaining expression is a difference of squares. Apply the difference of squares formula, which states that the difference between two squares equals the product of a sum and a difference.
The factor of a² - 2a + 1 - b² is _____?
Review the verified answer and explanation for this ETEA Educational Testing and Evaluation Agency past-paper question on CampusFin.