Développer puis réduire chaques expressions A=(x+2)(5x+3) B=(4y+7)(y+2) C=(7+3z)(2z+3) D=(10+8t)(9+2t)

Salut :)

A = (x + 2)(5x + 3)
A = (x) x 5x + (x) x 3 + 2 x 5x + 2 x 3
A = 5x² + 3x + 10x + 6
A = 5x² + 13x + 6

B = (4y + 7)(y + 2)
B = 4y x y + 4y x 2 + 7 x y + 7 x 2
B = 4y² + 8y + 7y + 14
B = 4y² + 15y + 14

C = (7 + 3z)(2z + 3)
C = 7 x 2z + 7 x 3 + 3z x 2z + 3z x 3
C = 14z + 21 + 6z² + 9z
C = 6z² + 13z + 21

D = (10 + 8t)(9 + 2t)
D = 10 x 9 + 10 x 2t + 8t x 9 + 8t x 2t
D = 90 + 20t + 72t + 16t²
D = 16t² + 92t + 90

J'espère t'avoir aidé(e)! :)