Répondre :
2i(i+1)+2i(2+i) = 2 i^2 + 2i + 4i + 2 i^2 = 4 i^2 + 6i = 2 i (2i +3)
2 solutions:
i = 0
2i+3 = 0 et i = -3/2
2 solutions:
i = 0
2i+3 = 0 et i = -3/2
Résoudre : 2i(i+1)+2i(2+i) =
2i (i + 1) + 2i (2 + i) = 2i ^ 2 + 2i + 4i + 2i ^ 2 = 4i ^ 2 + 6i = 2 i (2i +3)
2i + 3 = 0
d'où : i = -3/2
2i (i + 1) + 2i (2 + i) = 2i ^ 2 + 2i + 4i + 2i ^ 2 = 4i ^ 2 + 6i = 2 i (2i +3)
2i + 3 = 0
d'où : i = -3/2