Question: Please explain how as well, thank you Exercises 3 - 2 0 , identify and determine the nature of the critical points of the given

Please explain how as well, thank you Exercises 3-20, identify and determine the nature of the critical points of the given functions.
15.f(x,y,z)=x2-xy+z2-2xz+6z
17.f(x,y,z)=x2+y2+2z2+xz
Please explain how as well, thank you Exercises 3

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