Sagot :
[tex]bonsoir\\ \\ \\ 3 x + 5 = 2 x - 1 \\ 3 x - 2 x = - 1 - 5\\ x = - 6 \\ \\ 3 x + 12 - 5 x = 3 x - 3\\ - 2 x - 3 x = - 3 + 5\\ - 5 x = 2\\ x = - 2/5\\ \\ x^{2} + 2 x + 1 - 4 x + 6 = x^{2} + 3\\ x^{2} - x^{2} + 2 x - 4 x = 3 - 1 - 6 \\ - 2 x = - 4\\ x = 2\\ \\ x^{2} - 16 + 6 = x^{2} + 10 x\\ x^{2} - x^{2} - 10 x = 16 - 6\\ - 10 x = 10\\ x = - 1 \\ \\ [/tex]
Réponse :
Bonsoir
Explications étape par étape :
Résolution d'équations
A = 3x + 5 = 2x -1
A = 3x -2x = -5 -1
A = x = -6
B = 3 ( x +4) -5x = 3 ( x -1)
B = 3x + 12 -5x = 3x -3
B = 3x -5x - 3x = -12 -3
B = - 5x = -15
x = + 15/5 = 3
( x + 1)² - 4x + 6 = x² + 3
x² + 2x -4x -x² = +3 -1 -6
-2x = -4
x = 2
(x + 4) (x -4) + 6 = x (x + 10)
x² -16 + 6 = x² +10x
x² -x² -10x = +16 -6
- 10x = 10
x = 10/10 = -1