Answer:
(x - 6)(x + 3)
Step-by-step explanation:
Consider the factors of the constant term (- 18) which sum to give the coefficient of the x- term (- 3)
The factors are - 6 and + 3, since
- 6 × 3 = - 18 and - 6 + 3 = - 3, thus
x² - 3x - 18 = (x - 6)(x + 3) ← in factored form
