An equation of a plane parallel to the plane

Question:

An equation of a plane parallel to the plane $x-2 y+2 z-5=0$ and at a unit distance from the origin is:

  1. $x-2 y+2 z+5=0$

  2. $x-2 y+2 z-3=0$

  3. $x-2 y+2 z+1=0$

  4. $x-2 y+2 z-1=0$


Correct Option: , 2

Solution:

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