A = (3x + 4)(2x + 3) B = (-2x - 5)(7x + 8) puis calculer A et B pour x = 1 puis pour x = -3. svp aidez moi !!!​

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.