## Calculus with Applications (10th Edition)

Concave upward on $$(-2, 6).$$ Concave downward on $$(-\infty, -2) \text{ and } (6,\infty).$$ Inflection points at $$(-2,-4) \text{ and } (6,-1).$$
Since the graph of the function lies above its tangent line at each point of $(-2, 6)$ . So, concave upward on $$(-2, 6).$$ Since the graph of the function lies below its tangent line at each point of $(-\infty, -2)$ and $(6,\infty)$ . So, concave downward on $$(-\infty, -2) \text{ and } (6,\infty).$$ Since a point where a graph changes concavity is $(-2,-4)$ and $(6,-1)$ So, Inflection points at $$(-2,-4) \text{ and } (6,-1).$$