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Frequently Asked Questions (FAQ)
What is a principal square root?
The principal square root refers specifically to the non-negative (positive) square root of a number. In standard order of operations, the $\sqrt{\quad}$ symbol denotes the positive root ($\sqrt{81} = 9$).
Why do we add before dividing in this fraction?
In fractional expressions, the fraction bar acts as a grouping symbol. All terms above the bar (numerator) must be completely simplified into a single number before dividing by the denominator.