solve and check (a+5)^2=9

Question

Please help... Solve and check the equation below by taking the sq root of both sides. 

Also there's supposed to be two solutions and two checks which got me confused. Thanks in advance 

Answer 1

(a + 5)² = 9

a + 5 = ±3

a = -5 ± 3

 

{-8, -2}