5x-4x(x+2)= [tex] 3-(2x+1)^{2} [/tex]

Răspuns :

5x-4x(x+2)=3-(2x+1)²
5x-4x²-8x=3-4x²-4x-1
5x-8x=2-4x
-3x=2-4x
x=2