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Sagot :

Bonjour,

A = (4y + 2)(5y + 3)

A = 20y² + 12y + 10y + 6

A = 20y² + 22y + 6

B = (-4y - 2)(-5y - 3)

B = 20y² + 12y + 10y + 6

B = 20y² + 22y + 6

C = 6(2x - 3)

C = 12x - 18

D = 5(-4x - 7)

D = -20x - 35

E = (-2a + 4b)(5a - 2b)

E = -10a² + 4ab + 20ab - 8ab

E = -10a² + 16ab

F = 3a - (2a - 3b)

F = 3a - 2a + 3b

F = a + 3b

G = (-2a + 4b)(-5c + 2d)

G = 10ac + 4ad - 20bc + 8bd

Réponse :

A = (4y + 2)(5y + 3)

A = 4y*5y + 4y*3 + 2*5y + 2*3

A = 20y² + 12y + 10y + 6

A = 20y² + 22y + 6

B = (-4y - 2)(-5y - 3)

B = -4y*(-5y) -4y*(-3) -2*(-5y) -2*(-3)

B = 20y² + 12y + 10y + 6

B = 20y² + 22y + 6

C = 6(2x - 3)

C = 6*2x - 6*3

C = 12x - 18

D = 5(-4x - 7)

D = 5*(-4x) - 5*7

D = -20x - 35

E = (-2a + 4b)(5a - 2b)

E = -2a*5a -2a*(-2b) + 4b*5a + 4b*(-2b)

E = -10a² + 4ab + 20ab - 8b²

E = -10a² + 24ab - 8b²

F = 3a - (2a - 3b)

F = 3a - 2a + 3b

F = a + 3b

G = (-2a + 4b)(-5c + 2d)

G = -2a*(-5c) -2a*2d + 4b*(-5c) + 4b*2d

G = 10ac - 4ad - 20bc + 8bd

Voilà j'espère t'avoir aidé !

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