1) x² * (x+y)=x³+x²y
2) 2a * (a-5)=2a²-10a
3) (a+b) * 7=7a+7b
4) (3-x) * =
5) a² * (x+2y)=a²x+2a²y
6) 2a² * (5-b)=10a²-2a²b
7) (a-b) * (2 * (a+b))=(a-b) * (2a+2b)=2a²+2ab-2ab-2b²=2a²-2b²
8) d² * (3 * (a-b))=d² * (3a-3b)=3d²a-3d²b
9) (a-b)² * 6=(a²-2ab+b²) * 6=6a²-12ab+6b²