The unit normal vector n of the cone of revolution z2 = 4(x2 + y2) at the Point P (1, 0, 2) is?

([ frac{2}{ sqrt{5}}, 0, frac{1}{ sqrt{5}}] )

([- frac{2}{ sqrt{5}}, 0, - frac{1}{ sqrt{5}}] )

([ frac{2}{ sqrt{5}}, 0, frac{1}{ sqrt{5}}] )

The unit normal vector n of the cone of revolution z2 = 4(x2 + y2) a

1.	The unit normal vector n of the cone of revolution z2 = 4(x2 + y2) at the Point P (1, 0, 2) is?
A.	([ frac{2}{ sqrt{5}}, 0, frac{1}{ sqrt{5}}] )
B.	([ frac{2}{ sqrt{5}}, 0, frac{1}{ sqrt{5}}] )
C.	([- frac{2}{ sqrt{5}}, 0, - frac{1}{ sqrt{5}}] )
D.	([ frac{2}{ sqrt{5}}, 0, frac{1}{ sqrt{5}}] )
Answer» B. ([ frac{2}{ sqrt{5}}, 0, frac{1}{ sqrt{5}}] )

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