x < = -2, x # 2, x # -2, x = - 2, x ≥ 2, x − 2, x = √2, (x - 2), x = 2, X ≥ 2), X - 2, |x|=2, x = -2, |x-2, √ - x^2, √(x - 2), x=2, X:(-2, X² + 2, (X-2, x+2, √-x.(-2), X 2, √(x-2), x≠ -2, x:=2;, x + 2., = … x ( 2 + … ), = … x ( … - … + 2 ), x = 2× ….. + …..