Ртуть3

Verified answer

(a+1)(a-1)(a^2+1)-(9+a)^2=(a^2-1)(a^2+1)-a^2-18a-81=a^4-a^2-18a-82
a=1/3
(1/3)^4-(1/3)^2-18/3-82=1/81-1/9-88=(1-9)/81-88=-8/81-88