Question

The mirror image of point (2,3,7) in the plane 3x - y + 4z = 2 is (a, b, c) then the value of (2a + b + 2c) is

(1) 6 

(2)- 6

(3)-8

(4) 12

Answer 1

Correct option is (2) - 6

the mirror image of point (2, 3, 7) in given plane is \((-\frac{61}{13},\frac{68}{13},-\frac{25}{13})\)

the value of (2a + b + 2c) is -6