Definition:Positive Square Root/Notation

Positive Square Root: Notation

Note that, by convention, the symbol $\sqrt x$ always refers specifically to the positive square root of $x$.

Hence, while you may encounter the notation $+\sqrt x$ for the same concept, the $+$ sign is strictly speaking unnecessary.

Sources

• 1977: K.G. Binmore: Mathematical Analysis: A Straightforward Approach ... (previous) ... (next): $\S 1$: Real Numbers: $\S 1.10$: Quadratic equations
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): square root