2X^3 +mX^2 +(m-1)X -3 : X-1
-2X^3 +2X^2 2X^2 +(m+2)X+(2m-3)
--------------------
= (m+2)X^2 +(m-1)X
-(m-=+2)X^2 +(m+2)X
--------------------------
= (2m+1)X -3
-(2m+1)X +2m+1
------------------------
= 2m+2
Dar 2m+2 =-1 => 2m=-3 => m= -3/2
Inlocuim in P(X) => P(X) =2X^3- 3/2X^2 +(-3/2-1)X -3
P(X) =2X^3 -3/2X^2 -5/2X -3
2X^3 -3/2X^2 -5/2X -3 : X-2
-2X^3+4X^2 2X^2 +5/2X +5/2
------------------
= 5/2X^2 -5/2X
-5/2X^2 +5X
-------------------
= 5/2X -3
-5/2X +5
------------
= 2
Deci restul este 2