Answer :

Applying condition of perpendicularity between planes,


Where A, B, C are direction ratios of plane and A1, B1, C1 are of other


plane.



(1)



(2)


And plane contains the point (1,-1,2),


A(x-1) + B(y + 1) + C(z-2)=0 (3)


On solving equation (1) and (2)



Putting values in equation (3)




-5x + 5 + 7y + 7 + 3z-6=0


-5x + 7y + 3z + 6=0


5x-7y-3z-6=0


For equation of plane Ax + By + Cz=D and point (x1,y1,z1), distance of a


point from a plane can be calculated as




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