The graph of 
is shown in the figure. As you can see, the graph does not cross the x -axis. If the graph did cross the x -axis, the x -intercepts would be solutions to the equation 
. 
Solve this equation. The solutions will confirm the fact that the graph cannot cross the x -axis.
Definitions:
Tunica Media
Middle, usually muscular, coat of an artery or another tubular structure.
Capillary Beds
Networks of capillaries, the smallest blood vessels, that facilitate the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and tissues.
Precapillary Sphincters
Circular muscular valves located at the entrance of capillary beds, controlling blood flow into those beds.
Thoroughfare Channels
In traditional Chinese medicine, energy pathways that allow Qi and blood to circulate throughout the body, connecting different organs and bodily functions.
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