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Item 491

What is a Root?

We all know that \(\sqrt{4*4} = 4\) and \(\sqrt{3*3} = 3\). We know that \(\sqrt{12.4*12.4} =12.4\).

What's \(\sqrt{-4*-4} = ? \)

Which is it ... or both?


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Number Theory
Gabriel Rosenberg
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\(\sqrt{4} = 2\) or \( \sqrt{4} = -2\) or \(\sqrt{4} = \pm 2\) ???
From Gabriel Rosenberg via email: Which is it ... or both?
rt{4} = 2 or rt{4} = -2 or rt{4} = \pm 2 ???
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