Find local maxima and minima for 𝑦 = 𝑥^3/3 − 𝑥^2/ 2 − 2𝑥 + 1/ 3 and visualize the concavity

How to do this concavity part?

Answer 1

[Yongjian Feng]

My understanding here. First you need to find the local min and max. Once you find them, you know the proximity. Or say you know the range to plot in order to show the local min and max. Set the range and plot y.