Find the zeros of the function y=x^2-1

Answer: 1, - 1

Step-by-step explanation: This is a difference of squares when factored,

(x+1) (x-1)

Let's check using FOIL (First, outside, inside, last)

x * x = x^2

1 * x = x

x * (-1) = -x

1 * - 1 = -1

so x^2 + x - x - 1

=x^2 - 1