(a-1)^2x(а+1)-(а+1)x(а-1) при а=-3
(a-1)^2*(a+1)-(a+1)*(a-1)=a^3-2a^2-a+2
a^3-2a^2-a+2=(-3)^3-2*(-3)^2-(-3)+2=-45+3+2=-40
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(a-1)^2*(a+1)-(a+1)*(a-1)=a^3-2a^2-a+2
a^3-2a^2-a+2=(-3)^3-2*(-3)^2-(-3)+2=-45+3+2=-40