The value of x the number of cubic units in a box that is 4units high 4units deep and 4units wide. Which equation can be used to determine the value of x

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