Question

3а²+2а(5+2а)+10а
2а²-а(2а-5b)-b(2a-b)

Answer 1

3а²+2а(5+2а)+10а= 3а²+10а+4а²+10а=7а²+20а
2а²-а(2а-5b)-b(2a-b)=2а²-2а²+5аb-2аb+b²=2аb+b²

Answer 2

3a²+2a(5+2a)+10a=3a²+10a+4a²+10a=7a²+20a
2a²-a(2a-5b)-b(2a-b)=2a²-2a²+5ab-2ab+b²=b²+3ab=b(b+3a)