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Zero is the only number that has only one square root.

The square root of zero is zero.

All other numbers have two square roots.

The square roots of 4 are 2 and -2. Two is referred to as the "principal" square root.

When you get to the grade that discusses imaginary/complex numbers, you'll learn that negative numbers also have square roots. The square roots of -4 are 2i and -2i. 2i is the principal square root.

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โˆ™ 2009-12-17 23:46:03
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Q: What number has only one square root?
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