The definition of the error function also defines an "error term" E(x, y). Find E(x, y) for the function f(x, y) = - 2xy at the point (1, -1/2, 1).

Extracted text: The definition of the error function also defines an "error term" E(x, y). Find E(x, y) for the function f(x, y) = - 2xy at the point (1, -1/2, 1).


Extracted text: The definition of the error function also defines an "error term" E(x, y). Find E(x, y) for the function f(x, y) = - x? + 4y at the point (- 4, – 7).