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Functions : Concave Up and Concave Down

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6. (6--9) Determine the intervals on which the function is concave up and intervals on which the function is concave down. Check your answers by graphing the corresponding functions.
7. .
8. restricted to .

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Concave-up and concave-down functions are investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.

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