sketch the graph of the function. f(x) = 4 + x if x < −1 x2 if −1 ≤ x < 1 2 − x if x ≥ 1WebAssign Plot WebAssign PlotWebAssign Plot WebAssign PlotUse the graph to determine the values of a for which lim x ? a f(x) does not exist. (Enter your answers as a comma-separated list.)a =