A = 3 * 2x + 3 * (-1)
A = 6x - 3
B = (3x)^2 + 2 * 3x * (-5/2) + (-5/2)^2
B = 9x^2 - 15x + 25/4
Factoriser :
C = x(2x - 5)
D = (x)^2 - 2 * x * 4 + (-4)^2
D = (x - 4)^2
E = (x + 5)(3x - 4) + (x)^2 - (5)^2
E = (x + 5)(3x - 4) + (x - 5)(x + 5)
E = (x + 5)(3x - 4 + x - 5)
E = (x + 5)(4x - 9)
Résoudre les équations :
2x - 5 = 7
2x = 7 + 5
2x = 12
x = 12/2
x = 6
3x - 15 + 4 = 2 - 1 + x
3x - x = 15 - 4 + 2 - 1
2x = 12
x = 12/2
x = 6