(x-2)^2-49=0 помогите

(x - 2)^2 - 7^2 = 0 
(x - 2 - 7) (x-  2 + 7) = 0 
( x - 9) ( x + 5) = 0
x - 9 = 0 ==> x = 9 
x + 5 = 0 ==> x =  - 5