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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) = ?

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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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