Answered

Ex A: (3 x+ 5) (x - 2) - (3 x+ 5)
1.Développer et réduire A.
2.Factoriser A.
3.Calculer A si x = 2
4.Résoudre A = 0

Sagot :

PAN59
(3 x+ 5) (x - 2) - (3 x+ 5)

(3x+5) (x-2-1)

(3x+5) (x-3)

3x²-9x+5x-15 = 3x²-4x-15

delta = b²-4ac = 196
racine(delta) = 14

racines
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x1 = -1,667
x2 = 3

si x=2, A = 12-8-15 = -11
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