bonsoir quelqu’un pour m’aider svp ?
1) Calculer A = 5-3x (2x-1) pour x = 2
2) Calculer B= (3x+5) (7-x) pour x = -5
1) Calculer A = 5-3x (2x-1) pour x = 2
2) Calculer B= (3x+5) (7-x) pour x = -5
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A = 5 - 6 x² + 3 x
si x = 2
A = 5 - 24 + 6 = - 13
b = 21 x - 3 x² + 35 - 5 x = - 3 x² + 16 x + 35
si x = - 5
B = - 3 *25 + 16*- 5 + 35 = - 75 - 80 + 35 = -120