P = (x^2018- 12x^2017+ 29x^2016 ) + (y^2018- 12y^2017+ 29y^2016)

P=(x^2018-12x^2017+29x^2016)+(y^2018-12y^2017+29y^2016)
tính P với x=6+$\sqrt{7}$,y=6-$\sqrt{7}$