1. 4ab²*(5ab-3a²)=20a²b³-12a³b³.
2. bx+by=b*(x+y).
3. b*(y-z)-c*(y-z)=(y-z)*(b-c).
4.
a) (y-8)*(y+6)=0
y-8=0 y₁=8
y+6=0 y₂=-6.
б) y²-7y=0
y*(y-7)=0
y₁=0
y-7=0 y₂=7
в) 7x²+5x=0
x*(7x+5)=0
x₁=0
7x+5=0 7x=-5 x₂=-5/7.
6.
4¹¹-4¹⁰+4⁹=4⁹*(4²-4+1)=(16-3)=13*4⁹.