A level Maths

in algebra generally no, if you were to square root x^2 you would generally just write x by convention, but if you have a quadratic such as x^2=4, then when square rooting it is nescessary to specify that the root is plus or minus 2

If it's x^4=1, should we put +-

You need to be careful because that equation has 2 real roots and 2 imaginary roots (if you've covered complex numbers).

The real solutions are given by $x = \pm 1$.

But note that $\sqrt[4]{1} = 1$ because a function must be defined to return a single value

I still don't understand