Question #229231

If Ø(x, y, z) = x² - y²-2²-2, then ∇Ø at (2,1,-1) is ,,,choose the correct answer?

A) 4i +2j-2k

B)4i-2j-2k

C) 4i + 2j + 2k

D)4i - 2j +2k

Expert's answer

By definition, or, equivalently,

Now, just plug in the found partial derivatives to get the curl:

Finally, find the curl at the specific point.

The answer should be 4i - 6j+2k

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