Question

(x+9)^2=36

Answer 1

(x^2)+18x+81=36
(x^2)+18x+45=0
(x+15)(x+3)
x={-15,-3}

Answer 2

(x+9)(x+9)=36
x^2+18x+81=36
x^2+18x+45=0
x=-3 or -15

Answer 3

(x+9)*2 -36=0 - us formula a*2-b*2 =(a+b)(a-b)
(x+9-6)(x+9+6)=(x+3)(x+15)=0
x+3=0
x=-3
x+15=0 x_1 =-3
x=-15 x_2 =-15