Write a polynomial function in standard form with the given zeros.

x = 1,1,2

First we write factor form than we transform it into polynomial:

(x-1) (x-1) (x-2) = (x^2-2x+1) (x-2)

we multiplied first 2 factors. now we only need to multiply remaining factors and than to sum like terms

x^3 - 2x^2+x-2x^2+4x-2 = x^3 - 4x^2 + 5x - 2