$$\text { Find the critical number(s), if any, of the function } f ( x ) = x ^ { 3 } - 21 x + 4 \text {. }$$

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The Answer of $$\text { Find the critical number(s), if any, of the function } f ( x ) = x ^ { 3 } - 21 x + 4 \text {. }$$

Find the critical number(s), if any, of the function f(x)=x3−21x+4. \text { Find the critical number(s), if any, of the function } f ( x ) = x ^ { 3 } - 21 x + 4 \text {. } Find the critical number(s), if any, of the function f(x)=x3−21x+4.