Find each of the following products:
(9x2−x+15)×(x2−3)
(9x2−x+15)×(x2−3)=(9x2−x+15)×x2+(9x2−x+15)×(−3)=9x4−x3+15x2−27x2+3x−45=9x4−x3−12x2+3x−45
(9x2−x+15)×(x2−x−1)
Find each of the following products: (x2−3x+7)×(2x+3)
(x3−5x2+3x+1)×(x2−3)