el For the function z = f(x,y) = - 4x³ -6y² - 7xy, find t V ne ON dz dx dz 3x forr || f(-5,4)= (Simplify your answer.) = th_he f(-5,4)= (Simplify your answer.) dz dz ax' ay fx(-5,4), and fy(-5,4). 1

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A: