1)
2x²+ 24xy +72y² = 2 ·(х²+12ху+36у²) = 2·(х+6у)² = 2·(х+6у)(х+6у)
2)
-8a⁵ +8а³ - 2а = -2а·(4а⁴-4a²+1) = -2a·(2a²-1)² = -2a·(2a²-1)(2a²-1)
3)
5a³ - 40b⁶ = 5a³ ·(1-8b³) = 5a³ ·(1³ - (2b)³) = 5a³·(1-2b)(1+2b+4b²)
4)
8а³ -аb - a²b + а² = a·(8a²-b-ab+a)