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Sagot :

Réponse :

Explications étape par étape

Bonjour

Developper :

C = (3x + 2)^2 - (5 - 2x)(3x + 2)

C = (3x)^2 + 2 * 3x * 2 + 2^2 - (5 * 3x + 5 * 2 - 2x * 3x - 2x * 2)

C = 9x^2 + 12x + 4 - 15x - 10 + 6x^2 + 4x

C = 15x^2 + x - 6

Calcule C pour x = -2

C = 15 * (-2)^2 - 2 - 6

C = 15 * 4 - 8

C = 60 - 8

C = 52

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

D = 4x^2 + 12x + 9 + 14x^2 - 4x + 21x - 6

D = 18x^2 + 29x + 3

Calcule D pour x = -4

D = 18 * (-4)^2 + 29 * (-4) + 3

D = 18 * 16 - 116 + 3

D = 288 - 113

D = 175

F = (x - 1)(2x + 5) - (x - 1)^2

F = 2x^2 + 5x - 2x - 5 - (x^2 - 2x + 1)

F = 2x^2 + 3x - 5 - x^2 + 2x - 1

F = x^2 + 5x - 6

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