Determine the concavity of the curve at t=−3\displaystyle {t}=-{3}t=−3 :
x=−7t+2,y=−2t2−t−8\displaystyle {x}=-{7}{t}+{2},{y}=-{2}{t}^{{2}}-{t}-{8}x=−7t+2,y=−2t2−t−8
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