Find $(a)\underset{x{400}^{+}}{lim}{|}_{{?}_{?}}{x}_{{?}_{?}}|$ and $(b)\underset{x{400}^{-}}{lim}{|}_{{?}_{?}}{x}_{{?}_{?}}|$; then use the $limit$ definitions $to$ verify your findings.

$(c)$ Based $on$ your conclusions $in$ parts $(a)$ and $(b),$ can you say anything about $\underset{x400}{lim}{|}_{{?}_{?}}{x}_{{?}_{?}}|?$

$(a)\underset{x{400}^{+}}{lim}{|}_{{?}_{?}}{x}_{{?}_{?}}|=$