Find the differential of the function f(x,y)=−3x2−5xy−9y2f(x,y)=-3x2-5xy-9y2 at the point (−5,1)(-5,1) using Δx=−0.3Δx=-0.3 and Δy=−0.25Δy=-0.25   . dz=dz=    Now find ΔzΔz and compare it to your answer above Δz=Δz=    Hint: If entering a decimal, round to at least 5 places

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