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Réponse :

Exercice 4 :

Q = 2x (4 + 9x)

Q = 2x * 4 + 2x * 9x

Q = 8x + 18x²

R = 3x (x - 11) + 7

R = 3x * x + 3x * (- 11) + 7

R = 3x² - 33x + 7

S = 2 + 5x (4 + 3x)

S = 2 + 5x * 4 + 5x * 3x

S = 2 + 20x + 15x²

T = x (2 + x) + 5 (8 - 3x)

T = x * 2 + x * x + 5 * 8 + 5 * (- 3x)

T = 2x + x² + 40 - 15x

T = x² - 13x + 40

U = 6t² + 3 (5t - 4) - 2t (t - 15)

U = 6t² + 3 * 5t + 3 * (- 4) - 2t * t - 2t * (- 15)

U = 6t² + 15t - 12 - 2t² + 30t

U = 4t² + 45t - 12