I know what the answer is (according to all resources I checked, it should be a). However I have no clue how to get to it without using L'Hopital.

$\displaystyle $$\lim_{x\to\1} \frac{x^a - 1}{x-1}$$ $ $\displaystyle , $a\in$\mathbb{R}$ , a \geq 0 $

Thanks in advance.

Edit: should've probably said that $\displaystyle a\in$\mathbb{R}$ $, and is not just integers.