解方程~~[請進]急..幫手!!!

Questions and Answers :

1) (x+6)^2 = 9
2) (x-4)^2 -25 = 0


1) (x+6)^2 = 9
(x+6)^2 - 9 = 0
(x+6)^2 - (3)^2 = 0
(x+6+3)(x+6-3) = 0
(x+9)(x+3) = 0
x = -9 or -3 #

2) (x-4)^2 -25 = 0
(x-4)^2 - (5)^2 = 0
(x-4+5)(x-4-5) = 0
(x+1)(x-9) = 0
x = -1 or 9 #

1. x+6= 3 or x+6=-3
So x= -3 or -9

2. x-4= 5 or x-4=-5
So x= 9 or -1