Question: For the functions defined as follows, find all values of x and y such that both f x (x, y) = 0 and f y

For the functions defined as follows, find all values of x and y such that both fx(x, y) = 0 and fy(x, y) = 0.

ƒ(x, y) = 50 + 4x - 5y + x2 + y2 + xy

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