Résoudre dans ℝ les équations suivantes :
x3 + x2 + x + 1 = 0.
S = {-1; i; -i}.
S = {1; i; -i}.
S = {-1; 1; -i}.
S = {-1; i; 1}.
x3 + 3x2 - 3x - 10 = 0.
S = {-2; (-1-√21) /2 ; (-1+√21) /2}.
S = {-1; (-1-√21) /2 ; (-1+√21) /2}.
S = {2; (-1-√21) /2 ; (-1+√21) /2}.
S = {1; (-1-√21) /2 ; (-1+√21) /2}.
x3 + 6x2 + 12x + 8 = 0.
S = {-1; 1; 2}.
S = {-1; 1; -2}.
S = {2}.
S = {-2}.
x3 + x2 + 1/3 x + 1/27 = 0.
S={-1/3}.
S={-1; 1; -1/3}.
S={-1; 1; 1/3}.
S={1/3}.
x3 - 6x2 + 12x - 8 = 0.