calculus for life science absolute min and max 9.2

Question

Find the absolute maximum and the absolute minimum value of f(x)=3x^4−8x^3+8.

Enter​ "NA" in any answer box when no such answer exists.​(ROUND YOUR ANSWERS TO 3 DECIMAL PLACES​.)

The absolute maximum value is ___and it occurs when x​ = ___

The absolute minimum value is ____and it occurs when x​ = ____

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Answer 1

Determine f'(x)

Solve f'(x) = 0

Determine maximum/minimum