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9-(x+2) la puterea a2a=(7-x)(x+11)

Răspuns :

9-(x+2)²=(7-x)(x+11)
9-x²-4x-4=7x-11x-x²+77
5-x²-4x=-4x-x²+77
5=77 (Fals) ⇒ S:x∉R