Which expression means "the difference between two times six and five?" A 2×6−5
B 2×(6−5)
C 2×6−2×5
D 2−6−5

If (x + 8) is a factor of f(x), which of the following must be true? both x = –8 and x = 8 are roots of f(x). neither x = –8 nor x = 8 is a root of f(x). f(–8) = 0 f(8) = 0