1.(x^3+3x^2-4)(x^3+3x^2-4)=(x+4)(x-1)*(x+4)(x-1)=)=(x+4)^2(x-1)^2
2.x^3+9x^2+26x+24=
3.x^4+3x^3-3x^2-12x-4=x^3(x+3)-3x(x+3)-3(x+3)+5=