What are the solution (s) of x2-4=0

Is that x^2 - 4 = 0?

Then the two solutions are x = 2 and x = - 2

First you add 4 on both sides

X^2=0

Then you take square on both sides

X = + - the square root of 4

Simplify that

X=plus or minus 2

The answer can be either - 2 or + 2 (which is just 2)