use the power rule of a product rule to simplify the expression

We have
[tex](x^5y^3)^7[/tex]we will use the next power rule
[tex](a^n)^m=a^{n\cdot m}[/tex]with the above, in mind we will simplify the expression
[tex](x^5y^3)^7=x^{5\cdot7}y^{3\cdot7}=x^{35}y^{21}[/tex]