Partial derivative: please check work

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SUMMARY

The discussion centers on the calculation of partial derivatives for the function defined as (50 - x - y)(x+y) - x - (y^2)/2. The simplified form of the function is confirmed as 50x - x^2 - 2xy - 50y - (y^2)/2. The participant's derivatives for x and y are correctly identified as 49 - 2x - 2y and 50 - 2x - 3y, respectively. The discrepancy with the textbook answers, which state -1x and -1y, is acknowledged, highlighting a sign error in the simplification process.

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Homework Statement



(50 - x - y)(x+y) - x - ((y^2)/2))

simplified: 50X - X^2 - XY - 50Y - XY - Y^2 - X - ((Y^2)/2)

Homework Equations



50X - X^2 - XY - 50Y - XY - Y^2 - X - ((Y^2)/2))

The Attempt at a Solution



for x:
49 - 2x - 2y

for y:
50 - 2x - 3y

The book has the same, except -1x and -1y (i.e. 49 - 1x - 2y) and (50 - 1x - 3y). Why is this?
 
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I agree with your answers, except you have a sign wrong in the 'simplified' equation (which gets corrected in the final answer).
 
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