Bonsoir
factoriser et résoudre :
(Vx + 2)(3Vx - 8) + x - 4 = 0
(Vx + 2)(3Vx - 8) + (Vx)^2 - 2^2 = 0
(Vx + 2)(3Vx - 8) + (Vx - 2)(Vx + 2) = 0
(Vx + 2)(3Vx - 8 + Vx - 2) = 0
(Vx + 2)(4Vx - 10) = 0
(Vx + 2) * 2(2Vx - 5) = 0
2(Vx + 2)(2Vx - 5) = 0
Vx + 2 = 0 ou 2Vx - 5 = 0
Vx = 2 ou 2Vx = 5
x = 4 ou Vx = 5/2
x = 4 ou x = (5/2)^2
x = 4 ou x = 25/4
t^2 - 13 = 0
t^2 - (V13)^2 = 0
(t - V13)(t + V13) = 0
t - V13 = 0 ou t + V13 = 0
t = V13 ou t = -V13