Short & Sweet Math Challenge #21: Powers that be

[J-F Garnier]

Hi Valentin,

I'm very happy to read you again in this forum !

One question:
From the output examples here:

(11-02-2016 01:13 AM)Valentin Albillo Wrote:  
1.57367896839 x^8-x^7-x^6+x^2-1
1.59000537390 x^7-x^5-x^4-x^3-x^2-x-1
1.60134733379 x^7-x^6-x^4-x^2-1

it seems that null polynomial coefficients are allowed, not only +1 or -1,
Is it correct?

J-F