If the planes `x+2y+kz=0` and `2x+y-2z=0`, are at right angles, then the value of k is

If the planes x+2y+kz=0 and 2x+y-2z+3=0 are at right angles, then the value of k is.......

If the planes x+2y+kz=5 and 2x +y-2z=0 are at right angles, then the value of k is

If the planes x + 2y + kz = 0 and 2x+y - 2z = 0 are at rt. angles, then the value of k is:

If the planes 2x+y-2z=0and x+2y+kz=0 are at right angles, then the value of k is

Find the constant k so that the planes x-2y+kz=0 and 2x+5y-z=0 are at right angles. Find the equation of the plane through (1, -1, 1) and perpendicular to these planes.

The lines x+(k-1)y+1=0 and 2x+k^2y-1=0 are at right angles if

Find p if the planes 2x+3y+6z-13=0 and 6x+py-3z=0 are at right angles.

If the planes 2x-y-3z-7=0 and 4x-2y+5kz+9=0 are parallel then 5k^(2)+6 =

If the system of equations x+y+z=6, x+2y+kz=0 and x+2y+3z=10 has no solution, then the value of k is -