5. The polynomial function f(x) = x³ + 2x² - 21x + 18 has a known factor of (x-3).
Which expression represents f(x) as the product of linear factors? (5 points)
A. (x-3)(x-6)(x - 1)
B. (x − 3)(x+6)(x − 1)
-
C. (x-3)(x-6)(x + 1)
D. (x-3)(x+6)(x
+ 1)