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

127 millimeters is the answer