Answer :
Since every square root has a positive and a negative solution, for example:
[tex] \sqrt{9} [/tex] = -3 or +3
The principal square root defines only the positive solution (between the two);
Therefore: if y is the principal square root of 5, then it must be the positive square root of 5, not the negative square root of 5.
[tex] \sqrt{9} [/tex] = -3 or +3
The principal square root defines only the positive solution (between the two);
Therefore: if y is the principal square root of 5, then it must be the positive square root of 5, not the negative square root of 5.
