Réponses

Meilleure réponse !
2014-03-09T21:19:21+01:00
6x + 8 -5 = 10x -x +1
6x -10x +x = 1 +5 -8
-3x = -2
x = 2/3
(2x+3)² +5 = 4x² +12x +9 +5 = 4x² +12x +14

(x-5)(2x +6) = 4x +20
2x² +6x -10x -30 = 4x +20
2x² -4x -4x = 20 +30
2x² = 50
x² = 25
x = √5