Answer:
(x - 4)
Explanation:
x² - x - 12
to factor consider the factors of the constant term (- 12) which sum to give the coefficient of the x- term (- 1)
the factors are + 3 and - 4 , since
3 × - 4 = - 12 and + 3 - 4 = - 1 , then
x² - x - 12 = (x + 3)(x - 4) ← in factored form