1.5p²+10p=5p(p+2)
2.3x²y²+9xy=3xy(xy+3)
3.15a²-13a-20=
4.12p²y+9py-6py²=3py(4p+3-2y)
5.35a²+7a²b²+5b+b³=(35a²+7a²b²)+(5b+b³)=7a²(5+b²)+b(5+b²)=(7a²+b)(5+b²)
6.10b²a-15b²-8ab+12b+6a-9=(10b²a-15b²)-(8ab-12b)+(6a-9)=5b²(2a-3)-4b(2a-3)+3(2a-3)=(2a-3)(5b²-4b+3)