8, 9, ( equals eight to the first power times 9 to the zero power and eight to the zero power times nine to the first power )
72 ( equals eight to the first power times nine to the first power )
64 x 9 = 576, which Equals eight to the second power times 9 to the first power
81 x 8 = 648 which is nine to the second power times eight to the first power
