For the three-variable function f(x,y,z)=x2+2y2−3z2f(x, y, z) = x^2 + 2y^2 - 3z^2f(x,y,z)=x2+2y2−3z2, what is the Laplacian ∇2f\nabla^2 f∇2f?
000
222
−6-6−6
444