`(x + 2)` is a factor of `x^4- 6x^3 + 12x^2- 24x + 32`

`(x + 2)` is a factor of `x ^4 + 6x^3 - 12x^2 + 24x -32`

`(x- 2)` is a factor of `x^4-6x^3 + 12x^2 - 24x + 32`

`(x- 2)` is a factor of `x^4 + 6x^3 - 12x^2 + 24x- 32`