Bonjour,
a) 9 (x + 2)² - (2x - 2)² = 0
9 (x² + 4x + 4) - (4x² - 8x + 4) = 0
9x² + 36x + 36 - 4x² + 8x - 4 = 0
9x² - 4x² + 36x + 8x + 36 - 4 = 0
5x² + 44x + 32 = 0
(x + 8) (5x + 4) = 0
x + 8 = 0 ou 5x + 4 = 0
x = - 8 ou 5x = - 4
x = - 4/5
b) x + 3 - 4x - 3 = 1 - 5x - 12
2 3 6
3x + 9 - 8x - 6 = 6 - 5x - 12
3x - 8x + 5x = 6 - 12 - 9 + 6
0x -- > Impossible
c) 1 + 1 = 0
(x + 3) (x+ 1) (x + 2) (x + 3)
1 + 1 = 0
x² + x + 3x + 3 x² + 3x + 2x + 6
1 + 1 = 0
x² + 4x + 3 x² + 5x + 6
Je te laisse continuer
