Find the Requested Partial Derivative $$( \partial w / \partial z ) _ { x , y } \text { at } ( x , y , z , w ) = ( 1,2,9,266 ) \text { if } w = x ^ { 2 } + y ^ { 2 } + z ^ { 2 } + 10 x y z$$

question 378

Multiple Choice

Find the requested partial derivative.
- $$( \partial w / \partial z ) _ { x , y } \text { at } ( x , y , z , w ) = ( 1,2,9,266 ) \text { if } w = x ^ { 2 } + y ^ { 2 } + z ^ { 2 } + 10 x y z$$

• A) 28
• B) 33
• C) 38
• D) 48

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