Answer:
(x + 8)(x + 1)
Explanation:
Consider the factors of the constant term (+ 8) which sum to give the coefficient of the x- term (+ 9)
The factors are + 8 and + 1, since
8 × 1 = 8 and 9 + 1 = 9, hence
x² + 9x + 8 = (x + 8)(x + 1) ← in factored form