Решите уравнение: x^4-11x^2-12x-3=0

(x² -3x -3)(x² +3x +1) =0x² -3x -3 =0D =9+12 =21x1 =(3 -√21)/2x2 =(3+√21)/2x² +3x +1 =0D =9 -4 =5x3 =(-3 -√5)/2x4 =(-3 +√5)/2