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Find the Gradient Field of the Function f(x,y,z)=ln(x4+y5+z6)f ( x , y , z ) = \ln \left( x ^ { 4 } + y ^ { 5 } + z ^ { 6 } \right)

Question 71

Multiple Choice

Find the gradient field of the function.
- f(x,y,z) =ln(x4+y5+z6) f ( x , y , z ) = \ln \left( x ^ { 4 } + y ^ { 5 } + z ^ { 6 } \right)


A) f=4xln(y5+z6) i+5yln(x4+z6) j+6zln(x4+y5) k\nabla \mathrm { f } = \frac { 4 } { x } \ln \left( y ^ { 5 } + z ^ { 6 } \right) i + \frac { 5 } { y } \ln \left( x ^ { 4 } + z ^ { 6 } \right) j + \frac { 6 } { z } \ln \left( x ^ { 4 } + y ^ { 5 } \right) \mathbf { k }
B) f=4x3x4+y5+z6i+5y4x4+y5+z6j+6z5x4+y5+z6k\nabla f = \frac { 4 x ^ { 3 } } { x ^ { 4 } + y ^ { 5 } + z ^ { 6 } } i + \frac { 5 y ^ { 4 } } { x ^ { 4 } + y ^ { 5 } + z ^ { 6 } } j + \frac { 6 z ^ { 5 } } { x ^ { 4 } + y ^ { 5 } + z ^ { 6 } } k
C) f=1x4i+1y5j+1z6k\nabla f = \frac { 1 } { x ^ { 4 } } i + \frac { 1 } { y ^ { 5 } } j + \frac { 1 } { z ^ { 6 } } k
D) f=4x4i+5y5j+6z6k\nabla f = \frac { 4 } { x ^ { 4 } } i + \frac { 5 } { y ^ { 5 } } j + \frac { 6 } { z ^ { 6 } } k

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