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Sagot :

Réponse:

Bonsoir !

Explications étape par étape:

A= (x+4)(x+3)

A= x×x+x×3+4×x+4×3

A= x²+3x+4x+12

A= x²+7x+12

B= (y+3)(2y+8)

B= y×2y+y×8+3×2y+3×8

B= 2y²+8y+6y+24

B=2y²+14y+24

C= (3z+4)(5+6z)

C= 3z×5+3z×6z+4×5+4×6z

C= 15z+18z²+20+24z

C= 18z²+39z+20

D= (7t+8)(3+5t)

D= 7t×3+7t×5t+8×3+8×5t

D= 21t+35t²+24+40t

D= 35t²+61t+24

Bonne soirée et n'hésite pas si tu as des questions sur les calculs ;)

Bonsoir


developper :


A = (x + 4)(x + 3)

A = x^2 + 3x + 4x + 12

A = x^2 + 7x + 12


B = (y + 3)(2y + 8)

B = 2y^2 + 8y + 6y + 24

B = 2y^2 + 14y + 24


C = (3z + 4)(5 + 6z)

C = 15z + 18z^2 + 20 + 24z

C = 18z^2 + 39z + 20


D = (7t + 8)(3 + 5t)

D = 21t + 35t^2 + 24 + 40t

D = 35t^2 + 61t + 24

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