Answer:
D
Step-by-step explanation:
(x - 1)²
= (x - 1)(x - 1)
Each term in the second factor is multiplied by each term in the first factor, that is
x(x - 1) - 1(x - 1) ← distribute parenthesis
= x² - x - x + 1 ← collect like terms
= x² - 2x + 1 → D
