Bonjour
Développer et réduire les expressions suivantes :
A =-(2x + 5) + (-3x - 1)
A = - (- 6x² - 2x - 15x - 5)
A = 6x² + 2x + 15x + 5
A = 6x² + 17x + 5
B = -8(2x-7) +3(7x +1)
B = - 16x + 56 + 21x + 3
B = 5x + 59
C = 5x(x -8) - x(x - 1)
C = 5x² - 40x - x² + x
C = 4x² - 39x
D = 5x (2x - 3) - 5(x2 - 4)
D = 10x² - 15x - 5x² + 20
D = 5x² - 15x + 20
E=-3(- 4x + 3) -(-x + 3)
E = 12x - 9 + x - 3
E = 13x - 12
F= 3(x - 1) - x(x - 4) + 2x²
F = 3x - 3 - x² + 4x + 2x²
F = x² + 7x - 3
Calculer F
pour x = 1
F = x² + 7x - 3
F = 1² + 7 * 1 - 3
F = 1 + 7 - 3
F = 5
x = -2
F = x² + 7x - 3
F = (- 2)² + 7 * (- 2) - 3
F = 4 - 14 - 3
F = - 13
et x = 4
F = x² + 7x - 3
F = 4² + 7 * 4 - 3
F = 16 + 28 - 3
F = 41.