Answer
2
Work Step by Step
$\lim\limits_{x \to 1}$ $\frac{x^{2}-1}{x-1}$
= $\lim\limits_{x \to 1}$ $\frac{(x-1)(x+1)}{x-1}$
= $\lim\limits_{x \to 1}$ x+1
= 1+1
= 2
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