Răspuns :
- 6 = - 4 - 2
= x² - 4 +( x - 2 ) = ( x - 2 ) · ( x +2 ) + ( x -2) =
= ( x -2 ) ·( x +2 + 1 ) = ( x -2 ) · ( x + 3 )
= x² - 4 +( x - 2 ) = ( x - 2 ) · ( x +2 ) + ( x -2) =
= ( x -2 ) ·( x +2 + 1 ) = ( x -2 ) · ( x + 3 )
[tex]x^2+x-6=x^2-6+x=x^2-4-2+x=x^2-4+x-2= \\ =(x+2)(x-2)+x-2=(x-2)(x+2)+(x-2)= \\ =(x-2)(x+2+1)=(x-2)(x+3)[/tex]