a) ...= x^2(x+2)-16(x+2)=(x+2)(x-4)(x+4) ;
b) ...=[6*(x-2)]^2 - [5*(x+1)]^2=[6(x-2)+5(x+1)][6(x-2)-5(x+1)]=
=(6x-12+5x+5)(6x-12-5x-1)=(11x-7)(x-13) ;
c) ...=[4(x+5)+3(2x-3][4(x+5)-3(2x-3)]=(4x+20+6x-9)(4x+20-6x+9)=(10x+11)(-2x+29);
d) ...=[5x+2(x^2+2x-3)][5x-2(x^2+2x-3)]=(5x+2x^2+2x-6)(5x-2x^2+4x+6)=
=(2x^2+7x-6)(-2x^2+9x+6) = ...
e) ...=[x+rad3+2rad3)(x+rad3-2rad3)=(x+3rad3)(x+rad3) ;
restul poate mai tarziu !