Answer:
(x - 13) and (x + 3)
Explanation:
Given
x² - 10x - 39
Consider the factors of the constant term (- 39) which sum to give the coefficient of the x- term (- 10)
The factors are - 13 and +3, since
- 13 × 3 = - 39 and - 13 + 3 = - 10, thus
x² - 10x - 39 = (x - 13)(x + 3) ← in factored form