Question

For what value of A is the plane 2x-2y+z=3 is tangent to the

Answer 1

The center of the sphere in (0,0,0),radius A.The distance from (0,0,0) to the plane is:

A = |2*0 - 2*0 + 0 - 3|/√[2² + (-2)² + 1²] = 1