Bonjour,
Calculer les expressions A et B pour x = 1 :
A = (3x + 4)(2x + 3)
A = (3 × 1 + 4)(2 × 1 + 3)
A = (3 + 4)(2 + 3)
A = 7 × 5
A = 35
B = (-2x - 5)(7x + 8)
B = (-2 × 1 - 5)(7 × 1 + 8)
B = (-2 - 5)(7 + 8)
B = -7 × 15
B = -105
Calculer les expressions A et B pour x = -3 :
A = (3x + 4)(2x + 3)
A = (3 × (-3) + 4)(2 × (-3) + 3)
A = (-9 + 4)(-6 + 3)
A = -5(-3)
A = 15
B = (-2x - 5)(7x + 8)
B = (-2 × (-3) - 5)(7 × (-3) + 8)
B = (6 - 5)(-21 + 8)
B = 1(-13)
B = -13
Bonne journée.
