Let $f ( x ) = x ^ { 4 } - 4 x ^ { 3 }$

Let $f ( x ) = x ^ { 4 } - 4 x ^ { 3 }$ .(a) Use your graphing calculator to graph f using the default viewing rectangle.(b) Find the critical points of f and use them to determine an appropriate viewing rectangle (or rectangles) for f. The graph f again using the viewing rectangle.(c) Compare the graphs in parts (a) and (b)

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(b) Critical points ...

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