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Sagot :

Réponse :

Explications étape par étape

Bjr,

A= (2x+3)(3x+4)

2x*3x = 6x²

2x*4 = 8x

3*3x = 9x

3*4 = 12

=> 6x² +8x +9x +12 = 6x² +17x +12

B= (4x+5)(x+1)

4x² +4x +5x +5 = 4x²+ 9x +5

C=(2x+3)(6x+5)

12x² +10x +18x +15 = 12x² +28x +15

Bonjour,

A= (2x+3)(3x+4)

A= 6x^2+8x+9x+12

A= 6x^2+17x+12

B= (4x+5)(x+1)

B= 4x^2+4x+5x+5

B= 4x^2+9x+5

C= (2x+3)(6x+5)

C= 12x^2+10x+18x+15

C= 12x^2+28x+15

Bonne journée :)

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