# direction derivative

Let f(x) = e^(x+y+3z

a.) Find the directional derivative at P(-2,2,-1) in the direction of Q(18,-2,4)

b.) Find the direction of maximum decrease at P. (your answer does not have to be unit vector.) What is the maximum rate of decrease?

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#### Solution Summary

The direction derivative is expressed. The direction of maximum decrease at P are determined.

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