equale ressudu dans IR -3x+4=2x-6 2(2x+3)-4x(2x+3)=0​

Bonsoir

-3x + 4 = 2x - 6

-3x - 2x = - 4 - 6

-5x - 10 = 0

x = -10/-5

X = 2

2(2x + 3) - 4x ( 2x + 3) = 0

4x + 6 - 8x² - 12x = 0

- 8x² - 8x + 6 = 0

∆ = (-8)² - 4(-8)(6)

= 256

x = -b - √∆ / 2a = 8 - √256 / -16

X = 1/2

x = -b + √∆ / 2a = 8 + √256 / -16

X = - 3/2