JEE Main 2022 Mathematics question

If the mirror image of the point (2, 4, 7) in the plane 3x − y + 4z = 2 is (a, b, c), then 2a + b + 2c is equal to :

Answer: (3)

Solution

The value of the plane expression at the point is 3(2) − 4 + 4(7) − 2 = 28 and . The image satisfies (a − 2)/3 =

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Question ID VK-035318