Réponse :

Explications étape par étape

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A = (2 - x)(1 - 3x) + 4x(1 - 3x)

A = (1 - 3x)(2 - x + 4x)

A = (1 - 3x)(3x + 2)

B = 4x^2 - 9

B = (2x)^2 - 3^2

B = (2x - 3)(2x + 3)

C = (9 - x)(9 + x) + (9 + x)(2 - x)

C = (9 + x)(9 - x + 2 - x)

C = (9 + x)(-2x + 11)

D = x^2 + 2V2 x + 2

D = x^2 + 2 * x * V2 + (V2)^2

D = (x + V2)^2

E = (7 + 2x)^3 + (7 + 2x)(3 - x) + 7 + 2x

E = (7 + 2x)[(7 + 2x)^2 + 3 - x + 1]

E = (7 + 2x)(49 + 28x + 4x^2 + 4 - x)

E = (7 + 2x)(4x^2 + 27x + 53)

Verified answer

A(x) = (1-3x)(2-x+4x)

A(x) = (1-3x)(3x+2)

B(x) = (4x²-9²)

B(x) = (2x+3(2x-3)

C(x) = (9-x)(9+x)+(9+x)(2-x)

C(x) = (9+x)(9-x+2-x)

C(x) = (9+x)(-2x+11)

D(x) = x²+2V2x+2

D(x) = (x+V2)²

Bonne soirée.