Answer: Hello there!
here we have the equation x^2 - 4 = 0 and we want to find the solutions.
The first thing we need to do is isolate the x therm:
x^2 - 4 = 0
x^2 = 4
Now we know that x squared must be equal to 4, now we can apply the square root in both sides of the equation.
√x^2 = ± √4
x = ±2
so here we have two solutions, x= 2 and x = -2
where the ± appears because the square root has two solutions, 2 and - 2, because 2*2 = 4 and (-2)*(-2) = 4
