Solve the equation: sqrt z = -1

my answer:

(sqrt z)^2 = -1^2

z= 1

Excellent!

Solve the equation: sqrt 2a = 2

my answer:

(sqrt 2a)^2 = 2^2

2a = 4 Just complete the solution by dividing both sides by 2.

When one side of an eq is a SQRT, squaring both sides is the way to solve.

You're doing great.