Find the value of fa and fy at (1, -1) when 4 f(x,y) =+5x²+3y². xy 1. 1- = 9, f = = -7 2 2. f= = = 6, f- = 3. f=-1 = 14, f * 4. 1 f= - = - 6, fa-1) = = -10 = = -10 = 2 5. fa | = 14, fa-1 =

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