Descompuneti in factori, scotand factorul comun :
k) (2x+5)*[3(x-2)-2(x-4)]+2*(2x+5).


Răspuns :

   (2x+5)*[3(x-2)-2(x-4)]+2*(2x+5) = 
= (2x+5)[3(x-2) - 2(x-4) + 2] = 
= (2x+5)(3x-6 - 2x+8+2) =
= (2x+5)(x+4)