Bonsoir
Exercice 2
2) Développer et réduire les expressions
D = 5(x+3) + 2(3x+4) - (5x-3)
D = 5x + 15 + 6x + 8 - 5x + 3
D = 6x + 26
E = -3x(2+5x) -4(1-2x) + (3x² - 5x +3)
E = -6x - 15x² -4 + 8x + 3x² - 5x +3
E = -15x² + 3x² -6x +8x -5x -4 +3
E = -12x² - 3x -1
F = 3x + 5x(4-2x) -2(x² -3x +5)
F = 3x + 20x -10x² -2x² + 6x -10
F = -12x² + 29x -10