1.(a+2b)²-15(a+2a)-16
2.a²b²-23abc+60c²
3.a³-5a²b-24ab²
4.3ab²-9a²b²+6a³b²
1.(a+2b)²-15(a+2a)-16
2.a²b²-23abc+60c²
3.a³-5a²b-24ab²
4.3ab²-9a²b²+6a³b²
1.(a+2b)²-15(a+2a)-16
=(a+2b+1)(a+2b-16)
2.a²b²-23abc+60c²
=(ab-20c)(ab-3c)
3.a³-5a²b-24ab²
=a(a²-5ab-24b²)
=a(a+3b)(a-8b)
4.3ab²-9a²b²+6a³b²
=3ab²(1-3a+2a²)
=3ab²(2a-1)(a-1)