(6a-7)²-(4a-3)²=36a²-84a+49-(16a²-24a+9)=36a²-84a+49-16a²+24a-9=
=20a²-60a+40=20*(a²-3a+2)
a²-3a+2=0 d=1 a₁=2 a₂=1 ⇒
20*(a²-3a+2)=20*(a-2)*(a-1).
(6a-7)²-(4a-3)²=36a²-84a+49-(16a²-24a+9)=36a²-84a+49-16a²+24a-9=
=20a²-60a+40=20*(a²-3a+2)
a²-3a+2=0 d=1 a₁=2 a₂=1 ⇒
20*(a²-3a+2)=20*(a-2)*(a-1).