Find all values of x for which 
is concave down.Explain your reasoning.
Definitions:
Layer Clothing
Wearing multiple layers of clothing for protection against varying environmental conditions or for body temperature regulation.
Pedal Pulse
The pulse felt at the top of the foot, used to assess circulation to the lower extremities.
Surgical Procedure
An operative manual and instrumental technique performed for various purposes, such as to repair damages, diagnose issues, or restore function in the body.
IV Fluids
Liquids given through a vein to provide hydration, nutrients, or medication to patients.
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