(x-1)²

To simplify the expression (x-1)², we need to expand it.

(x-1)² = (x-1)(x-1)

Now, using the distributive property, we can expand the expression:

= x(x) - x(1) - 1(x) + 1(1) = x² - x - x + 1 = x² - 2x + 1

Therefore, the simplified expression is x² - 2x + 1.