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79 - 2 ( x + 1 ) la a 2 = 47

Răspuns :

[tex]79-2( x+1)^{2} =47=>2( x+1)^{2}=79-47=>2( x+1)^{2}=32 \\ =>( x+1)^{2}=16=>x+1=4=>x=3 [/tex]