What is the critical f(x,z)=x^3+z^3-3x-3z ?

The critical f(x,z)=x^3+z^3-3x-3z is (-1,1),(-1,-1),(1,1),(1,-1)

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critical f(x,z)=x^3+z^3-3x-3z

critical points

f (x, z) = x^{3} + z^{3} - 3 x - 3 z

(- 1, 1), (- 1, - 1), (1, 1), (1, - 1)

Solution steps

x^{3} + z^{3} - 3 x - 3 z

Find where

\nabla f (x, z)

is equal to zero or undefined

(- 1, 1), (- 1, - 1), (1, 1), (1, - 1)

What is the critical f(x,z)=x^3+z^3-3x-3z ?
The critical f(x,z)=x^3+z^3-3x-3z is (-1,1),(-1,-1),(1,1),(1,-1)