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Meilleure réponse !
  • Utilisateur Brainly
2014-03-23T12:32:56+01:00
(9-5x)²-(9-5x)(6x+1) = 0
(9-5x)(9-5x-6x-1) = 0
(9-5x)(-11x+8) = 0
9-5x = 0
-5x =-9
x = 9/5

-11x+8 = 0
-11x =-8
x = 8/11
2014-03-23T12:37:44+01:00
d)
(9 - 5x)² - (9 - 5x) (6x + 1) = 0
(9 - 5x) (9 - 5x - 6x - 1) = 0
(9 - 5x) (-11x + 8) = 0
9 - 5x = 0            - 11x + 8 = 0
-5x = - 9              - 11x = - 8
x = -9/5                  x = -8/11