Question

The image of the point $(1, 2, 3)$ in the plane $x + y + z + 3 = 0$ is

• A. (- 5, 4, - 3)
• B. (- 5, - 4, - 3)
• C. (5, - 4, 3)
• D. (5, 4, 3)

Answer 1

Answer: (B)

(- 5, - 4, - 3)

Answer 2

[$\because$ mid-point of line joining (1, 2, 3) and (- 5, - 4, - 3) is (- 2, - 1, - 0) lies on $x+y + z + 3$ = 0