Bonjour
Développe et réduis les expressions suivantes :
A = 3(x + 8) + 4(7x + 2)
A = 3x + 21 + 28x + 8
A = 31x + 29
D = (3 – 8x) – 5(4x – 7)
B = 3 - 8x - 20x + 35
B = - 28x + 38
B = 5(x – 1) – 7x(2 + 3x)
B = 5x - 5 - 14x - 21x²
B = - 21x² + 9x - 5
E = 7(3 – 2x) – 4x(2x – 1)
E = 21 - 14x - 8x² + 4x
E = - 8x² - 10x + 21
C = 2x(4 – 5x) – (x – 7)
C = 8x - 10x² - x + 7
C = - 10x² + 7x + 7
F = 7x – 5(2 – 9x) + 7(9x – 1)
F = 7x - 10 + 45x + 63x - 7
F = 115x - 17.
