(x^2 + x + 1).(x^2 + x - 2) -12, (x^2 - x + 1)(x^2 - x + 2) - 12, (x^2 - x + 1) * (x^2 - x + 2) = 12, (x^2 + x + 1) × (x^2 + x + 2) - 12, (x^2 - x + 1) (x^2 - x + 2) = 12, (x^2+x+1)(x^2+x+2)=12