Given polynomial p(x)=x2-4x+3
p(0)=(0)2-4(0)+3=
p(1)=(1)2-4(1)+3=1-4+3=
p(2)=(2)2-4(2)+3=4-8+3=
p(3)=(3)2-4(3)+3=9-12+3=
we see that p() and p() are zeros of the polynomial p(x).