Répondre :
Bonjour,
15x^2 + x - 6
Delta = (1)^2 - 4 * (-6) * 15
Delta = 361
Vdelta = 19 > 0 donc deux solutions
X1 = (-1 - 19)/(2 * 15) = (-20)/30 = -2/3
X2 = (-1 + 19)/(2 * 15) = 18/30 = 3/5
15x^2 + x - 6 = (x + 2/3)(x - 3/5)
15x^2 + x - 6
Delta = (1)^2 - 4 * (-6) * 15
Delta = 361
Vdelta = 19 > 0 donc deux solutions
X1 = (-1 - 19)/(2 * 15) = (-20)/30 = -2/3
X2 = (-1 + 19)/(2 * 15) = 18/30 = 3/5
15x^2 + x - 6 = (x + 2/3)(x - 3/5)