create table Example(exampleID int identity(1,1) not null primary key,
exampleInt int,
exampletext varchar(30),
myCalculatedColumn as exampleInt * 2 )
--syntax error, so this format is incorrect.
alter table Example Alter Column myCalculatedColumn as (exampleInt * 2 + 10)

ALTER TABLE dbo.MyTable
	DROP COLUMN OldComputedColumn

ALTER TABLE dbo.MyTable
             ADD NewComputedColumn AS OtherColumn + 10