Răspuns :
(x-2)^2 - (x-3)(x+3) = 9
x^2 - 4x + 4 - x^2 + 9 = 9
-4x + 4 = 0
-4x = -4
x= 1
x^2 - 4x + 4 - x^2 + 9 = 9
-4x + 4 = 0
-4x = -4
x= 1
[tex](x-2)^2-(x-3)(x+3)=9
x^2-4x+4-(x^2-9)=9
x^2-4x+4-x^2+9=9
-4x+4=0
-4x=-4
x=1
[/tex]