DAVIDMAZZUCCHE
Answered

factorisation de 15x²+x-6 avec les explications svp..merci

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LOULAKAR
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)