Advanced Placement (AP), 28.11.2019 10:31 10040813

What are all values of x for which the graph of y= 6x^2 + x/2 + 3 + 6/x is concave downward?

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What are all values of x for which the graph of y= 6x^2 + x/2 + 3 + 6/x is concave downward?
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