At What Value(s) of X Is the Function Discontinuous

question 121

Essay

At what value(s) of x is the function $$f ( x ) = \left\{ \begin{array} { l l } | x + 1 | - 1 & \text { if } x < 0 \\x ^ { 2 } + x & \text { if } 0 \leq x < 1 \\3 - x & \text { if } 1 \leq x\end{array} \right.$$ discontinuous?

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