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- #1

I know I just plug in two points to check its concavity...But How do I know what to choose between what and what? Like would I just choose between 0 and 1? And how do I know ?

Also suppose I have something like

\(\displaystyle - \frac{1}{4t^3}\)

would I pick a point that is to the right of and left -.25 so like 0 and -.5? and see that it always concaves up because it is cubed?