## Calculus: Early Transcendentals (2nd Edition)

$\lim\limits_{x \to a^{-}}{f(x)} = \lim\limits_{x \to a^{+}}{f(x)}= f(a)$
Real polynomials have R as their domain and they are continuous, so the limit is $\lim\limits_{x \to a^{-}}{f(x)} = \lim\limits_{x \to a^{+}}{f(x)}= f(a)$ (replacing $x$ with the value)