$\text { Find the gradient of } f ( x , y , z ) = x ^ { 4 } e ^ { y z } \text { at the point } P ( - 2,0 , - 9 ) \text {. }$

Q26: <span class="ql-formula" data-value="\text { Find three positive

Q27: Use the Chain Rule to find

Q28: Find all the second partial derivatives.

Q29: Find the limit <span class="ql-formula"

Q30: Find the maximum rate of change

Q32: Find and classify the relative extrema

Q33: Find the differential of the function.

Q34: Find the local maximum, and minimum

Q35: <span class="ql-formula" data-value="\text { Sketch the graph

Q36: Use implicit differentiation to find