Bonjour,
-Double distributivité:
(a + b)(c + b) = a*c + a*d + b*c + b*d
- Distributivité simple:
a(b + c) = a*b + a*c
Développer :
A = (3x + 7)(x + 6)
A = 3x² + 18x + 7x + 42
A = 3x² + 25x + 42
B = (4 - 2x)(3x + 5)
B = 12x + 20 - 6x² - 10x
B = -6x² + 2x + 20
C = (4x - 5)(-2x + 8)
C = -8x² + 32x + 10x - 40
C = -8x² + 42x - 40
D = 3x(5x - 7)
D = 15x² - 35x
E = (3x - 5)(-2x + 8)
E = -6x² + 24x + 10x - 40
E = -6x² + 34x - 40
Bonne journée.
