Devloper puis simplifier A=3(2x-1) B=(3x-5/2)² factoriser C=2x²-5x D=x²-8x+16 E=(x+5)(3x-4)+x²-25 les equations 2x-5=7 3(x-5)+4=2-(1-x)

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