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Question 20 Classify the point (1, 1) by the function f(x, y) = 4 + x3 + y2 – 3xy. Not a critical point Absolute minimum Loca
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fray) (a,b) = (1,1) 4+x² + y² - sny find pantial derivatives first of all for cany) = 3x²-3y we need to at Clio) fn (1,1)= 3x2 D = focx (a, b) ffy (a,b) - hry (a,b)) = from (1,1) fyy (1.1) - (fry (1,1))2 6x6 - (-3)2 1 36 - (9) D = 27 devahve test By

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