Please show ur work ty so much I appreciate it if u rlly help me

Can someone answer this question? : )

The longer leg of a 30-60-90 trangle is 18

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