Question

a problem for u

Answer 1

\[find \ real \ roots \ of \\ x^9+x^7+x^6+x^5+x^4+x^3+x^2+1=0\]

Answer 2

is x=-1 the only real root of the equation as the given equation can be factorised as
(x2+1)(x3+1)(x4+1)=0

Answer 3

\[(x(x(x(x(x(x+1)+1)+1)+1)+1)+1)x ^{2}+1=0\]