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

Răspuns :

Spidie
(x+3)²-2x-(2+x)²= N
x²+6x+9 -2x - 4 -4x -x²=N
x²-x² +6x- 2x- 4x +9 -4 = 5

R: 5 ∈ N
N=(x+3)^2-2x-(2+x)^2
N=x^2+6x+9-2x-(4+4x+x^2)
N=x^2+4x+9-4-4x-x^2
N=5