Answer:
principal square root
Step-by-step explanation:
Let [tex]x^2=a[/tex].
Then [tex]x=\pm\sqrt{a}[/tex]
We have a negative square root for x, which is [tex]x=-\sqrt{a}[/tex] and a nonnegative square root,which is [tex]x=+\sqrt{a}[/tex]
The nonnegative square root is callled the principal square root .
Therefore the best complete to the statement;
A -------- is the nonnegative Square root of a number, is principal square root.
