Learn how to use the second derivative test to find local extrema (local maxima and local minima) and saddle points of a multivariable function.

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Visit http://ilectureonline.com for more math and science lectures! In this video I will find the rate of change of the volume with respect to the radius (dV/dR=?) when R=5 and delta(R)=0.1, given V(R)=(4/3)(pi)R^3. Next video in this series can be seen at: https://youtu.be/G6EY5XQ9IAM

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