## frankdpnw 3 years ago #Mooc question In exercise 1.4, MIT6_189IAP11_hw1.pdf, how do I code for a 4th root in python. The problem that I am struggling with is finding the 4th root of -19+100. I know the answer but I don't know how to code it. I used the math.sqrt for one of the earlier problems.

1. senior_caliente

2. frankdpnw

Thank you. That works

3. jhstephenson

I did X**.25

4. peterdb

I puzzled over this wondering if Python had some special way to solve it. I then remembered that a root is the same as the exponential of the reciprocal so x = y**(1/4) Is there a more Pythonesque way to write this?

5. peterdb

Oh. that should have been x = y**(1.0/4)

6. velumani

a longer coding way would be to "import" math module and use math.sqrt function twice, like, math.sqrt(math.sqrt(x)) !!

7. Kyol

Is there a way if you import the math module to make an n-root instead of using two square roots in a row ?

8. velumani

@Kyol: When i looked for function that could do the nth root in the math module, i found none. But, there is the power function [pow()], the same as what @peterdb has stated above (which is simple and better). Then why import math function ...??!!