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Meilleure réponse !
  • Utilisateur Brainly
2014-03-16T18:37:15+01:00
Bonjour,

1) 100(x²+22x+121)-19600 =
     100x²+2200x+12100-19600 =
     100x²+2200x-7500

2)[10(x+11)-140][10(x+11)+140] =
(10x+110-140)(10x+110+140) =
(10x-30)(10x+250) =
10(x-3)(x+25)

3) 10(x-3)(x+25) =
     x-3 = 0
x = 3

x+25  =0
x = -25