Explanation
By definition, the nth root of a number can be calculated by raising that number to the power of 1/n. Exponents are entered using the exponentiation operator (^), with a number on the left and power on the right. So, in this example we get the numbers from column B and powers from column C:
=B5^(1/C5)
With the POWER function
The POWER function is another way to perform exponentiation in Excel. To get the nth root of a number with POWER, use the number with 1/n for the power argument:
=POWER(number,1/n)
So for the example shown, the formula in D5 would be:
=POWER(B5,1/C5)
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