Write a equation to represent the image

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

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?

How many and of which kind of roots does the equation f(x)=x3−x2−x+1