Answer
$y=x^2-1$
Work Step by Step
Use the intercept form:
$$y=a(x-p)(x-q)$$
Substitute $p=-1$, $q=1$ and let $a=1$:
$$y=1(x-(-1))(x-1)$$ $$y=(x+1)(x-1)$$ $$y=x^2-1$$
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