(x-1)²

To simplify the expression (x-1)², you can use the exponent rule which states that (a - b)² = a² - 2ab + b². In this case, a is x and b is 1.

So, (x-1)² = x² - 2(x)(1) + 1.

Simplifying further, we get:

(x-1)² = x² - 2x + 1.