Use a Graphing Device to the Graph of the Function $f ( x ) = x ^ { 4 } + 2 x ^ { 3 } - 3 x ^ { 2 } - 4 x + 4$

Essay

Use a graphing device to the graph of the function $f ( x ) = x ^ { 4 } + 2 x ^ { 3 } - 3 x ^ { 2 } - 4 x + 4$ . State approximately the intervals on which the function is increasing and on which the function is decreasing.