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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?