1. а) ...=с²+3с-2с-6-с²=с-6
б) ...=7х+56+х²-8х+8х-64=х²+7х-8
в) ...=4х²+20х-4х²-20х-25=-25
2. а) ...=8(х²-y²)=8*(x-y)*(x+y)
б) ...=-(а²-6а+9)=-(а-3)²
в) ...=ba(b²-a²) = ba*(b-a)*(b+a)
3. x(х-2)(х+1) = х²(х-1)
(х²-2х)(х+1) = х³-х²
х³+х²-2х²-2х-х³+х² = 0
-2х = 0
х = 0
4. а) ...=3(х-y)+xy(x-y) = (3+xy)(x-y)
б) ...=а³-2³=(а-2)(а²+2а+4)