If (x - 5) is a factor of f(x), which of the following must be true?
O
O
O
Aroot of f(x) is x = -5.
A root of f(x) is x = 5.
Both x = -5 and x = 5 are roots of f(x).
Neither x = -5 nor x = 5 is a root of f(x).