Algebra/Square Root is Positive

Square Root Is Not NegativeEdit

We often say that   is the positive number, which when squared is equal to  . If   this is perfectly correct, but if   then   which is not positive. So to be technically correct (which is part of the fun of math) we should say that   is the non-negative number, which when squared is equal to  .

If it is needed to express that a square root may be both positive and negative, you will see  .