Răspunsuri

2014-08-16T11:27:31+03:00
[(4x+1)-(2x+3)][(4x+1)+(2x+3)]=

=(4x+10-2x-3)(4x+1+2x+3)=

=(2x+7)(6x+4)=

=2(2x+7)(3x+2)