Three multiple choice questions, see attached image. thx ac

Question

Robert · Accepted Answer

An equation for the tangent plane to the sphere x
2
 + y
2
 + z
2
 – 2x – 4y + 3z = 13 at the 
point P(3, 4, -5) is  
Solution: f(x, y, z) = x
2
 + y
2
 + z
2
 – 2x – 4y + 3z -13
)7,4,4(
32
42
22










n
z
z
f
y
y
f
x
x
f

 
This is a normal vector for the plane.

Three multiple choice questions, see attached image. thx ac

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