Question: Let z = f ( x , y ) = 2 0 x 2 - 1 6 x y + 2 5 y 2 .

Let z=f(x,y)=20x2-16xy+25y2. Find the following using the formal definition of the partial derivative.
a.delzdelx
b.delzdely
c.delfdelx(1,4)
d.fy(1,-2)
Let z=f(x,y)=20x2-16xy+25y2. Find the following using the formal definition of the

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