# Derivatives Question

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- concave upward [math](-2/9, oo)[/math], concave downward [math](-oo, -2/9)[/math]
- concave upward [math](-oo, -2/9)[/math], concave downward [math](-2/9, -oo)[/math]
- concave upward [math](0, oo)[/math], concave downward [math](-oo, 0)[/math]
- concave upward [math](-oo, 0)[/math], concave downward [math](0, oo)[/math]