Find the equation of the tangent plane to the surface z = 
at the point(2, -2, 1) .
A) 4x - 8y - z = 23
B) 4x + 8y - z = -9
C) 4x - 8y + z = 25
D) 4x + 2y + z = 5
E) 4x - 8y - z = 9
Correct Answer:
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