$\"\"$

The equation of the sphere is $\"\"$ .

Group the like terms .

$\"\"$

Take out 9 as a common factor.

$\"\"$

Complete the each square.

$\"\"$

Compare the equation with standard equation of the sphere is $\"\"$ .

The center of the sphere is $\"\"$ .

The radius of the sphere is $\"\"$ .

$\"\"$

The standard equation of the sphere is $\"\"$ .

The center of the sphere is $\"\"$ and radius $\"\"$ .