Mathématiques

Question

aidez moi SVP :

D = (4x +5)² - 5(4x + 5)
E = (7x -3)(2x + 5) + (x-4)(7x - 3)
F = 2x(5x - 8) - (3x + 1)(5x - 8)

merci pour votre aide;

1 Réponse

  • D = (4x + 5)² - 5(4x + 5)
    D = 16x² + 40x + 25 - 20x - 25
    D = 16x² + 40x - 20x + 25 - 25
    D = 16x² + 40x - 20x

    E = (7x -3) (2x + 5) + (x - 4) (7x - 3)
    E = 14x² + 35x - 6x - 15 + 7x² - 3x - 28x + 12
    E = 14x² + 7x² + 35x - 6x - 3x - 28x - 15 + 12
    E = 21x² - 2x - 3

    F = 2x (5x - 8) - (3x + 1)(5x - 8)

    F = 10x² - 16x - (15x² - 24x + 5x - 8)
    F = 10x² - 16x - 15x² + 25x - 5x + 8
    F = 10x² - 15x² - 16x - 5x + 25x + 8
    F = - 5x² + 4x + 8

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