Question

check wheather -2 and 2 are zeroes of the polynomial x+2

Answer 1

here -2 is the zeros of the polynomial but 2 is not the zeros of the polynomial.i. e,
x+2=
-2 +2=0,and
x+2=
2+2=4{not}
hence proved.

Answer 2

this may be usefull for you.