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Question

If the perpendicular distance from the point (1,2,2) to the plane 3x4y+2z+k=0 is 29, then k= ____
(k<0).

A
44
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B
44 and 14
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C
44
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D
14
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Solution

The correct option is D 14
given the perpendicular distance

from the formula of perpendicular distance of a point to a plane we get

|3(1)4(2)+2(2)+k9+16+4|=29

|k15|=29

k=44 or -14

but k<0

therefore

k=14

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