Question

what polynomial function is x=3, -2, 1

Answer 1

Have you tried constructing one? :)

Answer 2

Are they roots or the values itself?

Answer 3

Assuming that those are the roots of the polynomial, the typical 'template' is the following:\[(x-a_1)(x-a_2)\cdots(x-a_n)=0,\]where each ai is a root. You can then expand that expression and see what you get. :)