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n-th Root

Syntax: rt(x; n[; k])

Example Syntax Output
3√8 rt(8; 3) 2
4√(16) = (16)1/4 rt(16; 4; 0)
rt(16; 4; 1)
rt(16; 4; 2)
rt(16; 4; 3)
2
2*i
-2
-2*i

This function returns the kth possible value of a nth root of a (complex) number x. The parameter k may be omitted (thus setting it to zero), but must always be in the following range:

k = 0, 1, 2, … (n-1)
0 ≤ k < n