Question

f(x) = 5 + 54x - 2x^3,  [0, 4]      Find the absolute maximum and minimum values of f on the given interval

Accepted Answer

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 x=-3 is not in the given interval [0, 4]. Therefore x=-3 will not be used to find the absolute maximum or absolute minimum value. Plug in the critical value x=3 and the endpoints of the interval [0, 4] into the original f(x) function. 
f(0)=5
f(3)=113
f(4)=93
Examine the f(x) value to determine the absolute maximum and absolute minimum. 
The absolute maximum occurs at the point (3, 113).
The absolute minimum occurs at the point (0, 5).

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`f(x) = 5 + 54x - 2x^3, [0, 4]` Find the absolute maximum and minimum values of f on the given interval

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