Question: I need help with showing test intervals and test values. I get confused when it ask for sign diagram. These are my study guide questions.

I need help with showing test intervals and test values. I get confused when it ask for sign diagram. These are my study guide questions. I'am stuck at first derivative and don't know what to do after that step.

SECTION 3.1 - Find the open intervals on which the function is increasing or decreasing. Write answer using interval notation. Show test intervals and test values to support answer. No credit without a sign diagram. 40) h(x) = 27x - x3 41) f (x) = x4 - 8x2 - 8

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