Step-by-step explanation:

let us assume p(x) = (x-1) - (x² - 1)

=> p(x) = (x-1) - (x-1)(x+1) (using a² - b² = (a + b)(a - b)

=> p(x) = (x - 1)(1 - (x + 1))

=> p(x) = (x-1)(-x)

therefore, factors of p(x) are (x - 1) and (-x)