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Find all values of x and y such that fx(x, y) = 0 and fy(x, y)...

Find all values of x and y such that fx(x, y) = 0 and fy(x, y) = 0 simultaneously.

f(x, y) = x2 + 3xy + y2 − 19x − 16y + 40

(x,y) = ( ___ , ___ )

Math   Calculus   
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