Question

aratati ca n=(2x+1)2 -3(x_2)(x+2)-(2+x)2 este nr natural patarat perfect 

Answer 1

[tex]n=(2x+1)^2-3(x-2)(x+2)-(x+2)^2\\ n=4x^2+4x+1-3x^2+12-x^2-4x-4\\ n=12+1-4\\ n=9\\ \boxed{n=3^2}[/tex]