Find the distance of the point (2, 1, - 1) from the plane x – 2y + 4z = 9.
Formula : 
where (
) is point from which distance is to be calculated
Therefore ,
x - 2y + 4z = 9
x - 2y + 4z – 9 = 0
Point = ( 2 , 1 , - 1 )
Distance 
1
Find the distance of the point (2, 1, - 1) from the plane x – 2y + 4z = 9.
Formula :
where () is point from which distance is to be calculated
Therefore ,
x - 2y + 4z = 9
x - 2y + 4z – 9 = 0
Point = ( 2 , 1 , - 1 )
Distance