Hey
When you are square rooting both sides of the equality, why do you have to apply plus or minus?
x^2 = 4
x = + or - sqrt(4)
NOTE: I reinstalled windows and couldn't use MathType to generate TEX.
Sam
Because $\displaystyle (-x)^2 = (-x) \cdot (-x) = x^2$
By the way $\displaystyle \sqrt{4} = 2$
For tex wrap your equation with [tex]...[/tex] where ... represents your equation. For example my first line is [tex](-x)^2 = (-x) \cdot (-x) = x^2[/tex]
You can also quote someone else's post and see what they've done