[tex] {x}^{n} \times {x}^{m} = {x}^{n + m} [/tex]

[tex](x {}^{n} ) {}^{m} = {x}^{n \times m} [/tex]

[tex]5a \times ( - 3a {}^{3} ) {}^{2} = 5a \times 9 {a}^{6} = 45a {}^{7} [/tex]