The plane `2x-2y+z+12=0` touches the surface `x^2+y^2+z^2-2x-4y+2z-3=0` only at point `(
Channel: Doubtnut
Date: 24/05/2020

The plane `2x-2y+z+12=0` touches the surface `x^2+y^2+z^2-2x-4y+2z-3=0` only at point `(-1, lambda, -2)`. The value of `lambda` must be