*math (7)
posted by Mia .
Evaluate the first partial derivatives of the function at the given point.
f(x, y) = x^2 + xy + y^2 + 2x  y ;
at (5, 4)
fx(5, 4) = ?
fy(5, 4) = ?

*math (7) 
Kuai
f(x, y) = x^2 + xy + y^2 + 2x  y ;
at (5, 4)
fx(5, 4) = 2x + y +2 = 10+ 4 + 2 = 4
fy(5, 4) = x + 2y 1 = 5 + 8 1 = 2
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