Determine where the function is concave downward. 
Definitions:
Flat
Referring to a surface or shape having a smooth, even, and continuous plane without any significant curvature or elevation.
Resonance Structures
Different Lewis structures that represent the same molecule, used to depict delocalized electrons within certain compounds.
Cyclopentadiene
A cyclic hydrocarbon with the formula C5H6, known for its role in Diels-Alder reactions.
Acidic Hydrogen
A hydrogen atom bonded to an electronegative atom, making it easily released as a proton (H+).
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