Question

Find the zeros of y=x²-1 from a graph.

Answer 1

y = x² - 1

I can find the zeros from a graph, but that won't help you any, because
I'm not about to draw the graph and then post it here.

y = (x + 1) (x - 1)

y = 0 when x = +1 or x = -1.

Answer 2

`y=x^2-1`


`0=x^2-1`


`0=(x+1)(x-1)`


`x+1=0`


`x=-1`


`x-1=0`


`x=1`


`zeros:-1,1`