Question

Descompusa in factori expresia a la a 3-a la a2-a+1 este...

Answer 1

= a² ( a -1) - ( a -1 ) = (a -1 ) ·( a² -1 ) = ( a -1) ·( a -1) ·( a + 1) =
 = ( a -1) ² ·( a +1) 

Answer 2

$a^3-a^2-a+1=a^2(a-1)-(a-1)=(a-1)(a^2-1)= \\ =(a-1)(a-1)(a+1)=(a-1)^2(a+1)$