Bonjour,vous pouvez m’aidez svp

Exercice 1 :

A = 2(x +1 4)

A = 2x + 2×14

A = 2x + 28

B = y(7 - y) + 3(7 - y)

B = 7y - y² + 3×7 - 3y

B = y² + 7y - 3y + 21

B = y² + 4y + 21