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if y is the principal square root of 5 what must be true?

Sagot :

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.