Question

решить (a-1)^3-4a(a+1)*(a-1)+3(a-1)(a^2+a+1) если а=-2

Answer 1

(a-1)³ -4a(a+1)(a-1)+3(a-1)(a²+a+1)=
=a³ -3a²+3a-1-4a(a² -1)+3(a³ -1³)=
=a³ -3a²+3a-1-4a³ +4a+3a³-3=
=-3a²+7a-4=
=-3*(-2)² +7*(-2)-4= -12 - 14 - 4= -30