What is a polynomial function in standard form with zeros 1,-1,2, and 4

Because the zeros are 1, - 1, 2, 4, the factors are

(x-1) (x+1) (x-2) (x-4)

to put in standard form, you have to write the terms in order by degree, so you have to expand the above expression:

(x^2-1) (x^2-6x+8)

further expand it:

x^4-6x^3+7x^2+6x-8