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Question

Solve this:
Q.17. An equation of a plane parallel to the plane x - 2y + 2z - 5 = 0 and at a unit distance from the origin is
(a) x - 2y + 2z - 1 = 0
(b) x - 2y + 2z + 5 = 0
(c) x - 2y + 2z - 3 = 0
(d) x - 2y + 2z + 1 = 0

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Solution

Dear student
Remark: Equation of any plane parallel to the plane ax+by+cz+d is ax+by+cz+d1=0Distance of the plane ax+by+cz+d=0 from origin is da2+b2+c2Let the equation of the plane paralle to x-2y+2z-5=0 be x-2y+2z+d=0Given that this plane is at unit distance from origin.d12+(-2)2+(2)2=1d9=1d=±3Required equation of the plane is x-2y+2z-3=0
Regards

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