Question

xy+x+y+1 (descompuneti in factori va rog)

Answer 1

xy + x + y + 1 =
( x factor comun ) 
= x × ( y + 1 ) + y + 1 =
( y + 1 factor comun ) 
= ( y + 1 )( x + 1 )

Answer 2

xy+x+y+1 = (xy + y ) + (y + 1 ) = x(y+1) + (y+1) = (y+1)(x+1)