I have two problems that I'm not sure if I did them right.
The first one is:
Solve the equation: sqrt z = -1
(sqrt z)^2 = -1^2
The second one is:
Solve the equation: sqrt 2a = 2
(sqrt 2a)^2 = 2^2
2a = 4
Please help me understand this eqations.
Thank you in advance.