Answer
Function
V=x6y4z0−z3yx3−89
So
Gradient vector
∇V=(idxdV+jdydV+kdzdV)
Putting value of function
∇V=i(6x5y4−3x2yz3)+j(4x6y3−z3x3)+k(−3z2yx3)
Now at point (3,-2,1)
∇V=23382i+23355j+162k
Now it's magnitude
∣∇V∣=(23382)2+(23355)2+(162)2)=33048.5
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