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Va rog mult URGENT!!!

Rezolvati in R ECUATIA x(x+2)-(x-3)(x+3)=12


Răspuns :

E = x(x+2)-(x-3)(x+3) = 12

= x^2 + 2x - (x^2 - 3^2) = 12

= x^2 + 2x - x^2 + 9 = 12

= 2x + 9 = 12

=> 2x = 12 - 9 = 3 => x = 3/2