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Nth root




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Nth root of a number r is a number which, if multiplied by itself n times, makes r. You could also say that it is a number k for which the equation is true:

[math]k^n=r[/math]

(for meaning of [math]k^n[/math], read exponentiation.)

We write it like this: [math]\sqrt[n]{r}[/math].