I'm having some trouble with this question:

$\displaystyle Consider\ the\ function$

$\displaystyle f(x)=\frac{x^3-6x^2+11x-6}{x-a}$

$\displaystyle This\ is\ not\ continuous\ at\ x=a.$ $\displaystyle For\ which\ values\ of\ a\ is\ the\ disconuity\ removable?$