Bonjour,
58)
a. Rappel formule aire rectangle :
A = Longueur x Largeur
Donc :
1) (x + 3) * (x + 2)
2) (x * x) + (3 * x) + (2 * x) + (3 * 2)
3) (x + 3) * x + (x + 3) * 2
4) (x + 2) * x + (x + 2) * 3
b.
1) (x + 3) * (x + 2) = x² + 2x + 3x + 6 = x² + 5x + 6
2) (x * x) + (3 * x) + (2 * x) + (3 * 2) = x² + 3x + 2x + 6 = x² + 5x + 6
3) (x + 3) * x + (x + 3) * 2 = x² + 3x + 2x + 6 = x² + 5x + 6
4) (x + 2) * x + (x + 2) * 3 = x² + 2x + 3x + 6 = x² + 5x + 6.
59)
a. (x + 5) (x + 3) = x² + 3x + 5x + 15 = x² + 8x + 15
b. (3x + 2) (x + 4) = 3x² + 12x + 2x + 8 = 3x² + 14x + 8
c. (x + 3) (x - 2) = x² - 2x + 3x - 6 = x² + 5x - 6
d. (x - 4) (x - 1) = x² - x - 4x + 4 = x² - 5x + 4.
