what is the square root of 4?

thanks Chris, I just want to clarify

$$\sqrt4 = +2$$

Since the square root was in the original question the answer is positive

Chris DID say this, I just wanted to stress it.

Re: what is the square root of 4?

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I believe the standard convention is to take the positive root (2), unless we're solving equations. For instance,

x² = 4

√x² = √4

x = ± 2

Note that the square root of 4 here has two values.