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Let f(x,y)=1x+y2f ( x , y ) = \frac { 1 } { x + y ^ { 2 } }

Question 210

Multiple Choice

Let f(x,y) =1x+y2f ( x , y ) = \frac { 1 } { x + y ^ { 2 } } . Find the gradient vector f(1,1) \nabla f ( 1,1 ) at the point (x,y) =(1,1) ( x , y ) = ( 1,1 ) .


A) ij- i - j

B) 14i12j- \frac { 1 } { 4 } \mathbf { i } - \frac { 1 } { 2 } \mathbf { j }
C) i12j- \mathbf { i } - \frac { 1 } { 2 } \mathbf { j }
D) 12ij- \frac { 1 } { 2 } \mathbf { i } - \mathbf { j }
E) i+j\mathbf { i } + \mathbf { j }
F) 14i+12j\frac { 1 } { 4 } \mathbf { i } + \frac { 1 } { 2 } \mathbf { j }

G) i+12j\mathbf { i } + \frac { 1 } { 2 } \mathbf { j }

H) 12i+j\frac { 1 } { 2 } \mathbf { i } + \mathbf { j }

Correct Answer:

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