College Algebra / Alg 041 · Atom · ~20 seconds
The Principal Square Root
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State
The principal square root of a nonnegative number is the nonnegative number that, multiplied by itself, equals it; the radical symbol √ denotes that root.
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√25 = 5. Both 5² and (−5)² equal 25, but the radical points at the nonnegative one.
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√25 is 5, never ±5.
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