Given polynomial p(x)=x2 - 4
We have x2-4=(x- )(x+ )
So, the value of x2 - 4 is zero
when x- =0 or x+ =0
x= or x=-
so the zeros of x2-4 are and -
sum of the zeros= +(- )=
And product of the zeros = ×(- )= -