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Question: Answered & Verified by Expert
A point on the plane determined by the points A(1, 1, -1), B(2, -1, 0) and C(-1, 0, 2) among the following is
MathematicsThree Dimensional GeometryTS EAMCETTS EAMCET 2021 (05 Aug Shift 2)
Options:
  • A (1, 2, -2)
  • B (2, 1, -3)
  • C (2, -2, 2)
  • D (2, 1, 2)
Solution:
2679 Upvotes Verified Answer
The correct answer is: (1, 2, -2)

Given:A plane passing through the points Ax1,y1,z11,1,-1Bx2,y2,z22,-1,0 and Cx3,y3,z3-1,0,2

Equation of plane passing through A,B & C is

x-x1y-y1z-z1x2-x1y2-y1z2-z1x3-x1y3-y1z3-z1=0

x-1y-1z+12-1-1-10+1-1-10-12+1=0

x-1y-1z+11-21-2-13=0

x-1-6+1-y-13+2+z+1-1-4=0

-5x-5y-5z+5=0

-x-y-z+1=0.......1

Putting x=1, y=2, z=-2

-1-2+2+1=0

0=0

Hence, points 1,2,-2 satisfy the equation of plane so 1,2,-2 lies on the plane 1.

Putting x=2,y=1,z=-3 in 1, we get

-2-1+3+10

Point 2,1,-3 does not lie on the plane 1.

Again putting x=2,y=-2,z=2 in 1, we get

-2+2-2+10

Point 2,-2,2 does not lie on the plane 1.

Also putting x=2,y=1,z=2 in 1, we get

-2-1-2+10

Point 2,1,2 does not lie on the plane 1.

Hence, option 1 is correct.

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