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5.7 Using the Second Derivative Test to Determine Extrema

1 min readβ€’june 8, 2020

Sumi Vora

Sumi Vora


AP Calculus AB/BC ♾️

279Β resources
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πŸŽ₯Watch: AP Calculus AB/BC - Concavity and f, f', f''

Using the Second Derivative Test

If we combine our knowledge of first derivatives and second derivatives, we find that we can use the second derivative to determine whether a critical point is a relative minimum or relative maximum. ❗️
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In other words, if we know that there is a local extreme at a certain point and the graph is concave up at that point, it must be a minimum, and, if the graph is concave down at that point, it must be a maximum. πŸ™‹β€β™‚οΈ

Example Problems

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https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2FScreenshot%20(559).png?alt=media&token=942c24a2-a078-486d-bcf7-fed0745e0647
We can find the critical points of implicit functions in a similar manner. The critical points occur when dy/dx = 0.
https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2FScreenshot%20(562).png?alt=media&token=87671976-7757-4cd8-97df-c2864c434bb5
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