Given: `f(x)=5+54x-2x^3,[0,4]`

Find the critical value(s) by setting the first derivative equal to zero and solving for the x value(s).

`f'(x)=54-6x^2=0`

`54=6x^2`

`9=x^2`

`x=3,x=-3`

The critical value is x=3. The value...

(The entire section contains 113 words.)

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