(x³+1)(x⁶-x³+1)=x⁹-5x помогите решыть

Question

(x³+1)(x⁶-x³+1)=x⁹-5x помогите решыть

Answer 1

Х^9 - х^6 + х^3 + х^6 - х^3 + 1 = х^9 + х^3 + 1

Answer 2

X^9-x^6+x^3+x^6-x^3+1=x^9-5x
1+5x=0
5x=-1
X=-1/5