If both first and second derivatives are zero then what can you conclude
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The meaning behind the first and second derivative
Using the Second Derivative (4 of 5: Examples where f"(x)=0 doesn't mean Point of Inflexion)
Why Derivative of a Function is Zero (+ Proof)
Why second derivative is negative at Maxima or Why second derivative is positive at minima?
2nd Derivative Test
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Sketch Graph with Second derivative less than zero and first derivative approaching infinity
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Multi-variable Optimization & the Second Derivative Test
Section 2.4.2 - First and Second Derivatives as Positive, Negative, and Zero (Graph)
Concavity, Inflection Points, and Second Derivative