Question 661099
What you need to remember is that a positive number and it's additive inverse both give you the same number when they are squared. Eg;  4 and -4 both give you 16 when they are squared.

The square root of 36 is 6. The solutions for x then must be either 6 squared or -6 squared. 

x+2=6   and   x+2=-6   then are equations that give the two solutions.

x+2=6
x=4

x+2=-6
x=-8

(4,-8)