[tex] \huge \boxed { \sf \: Answer}[/tex]
We have to use the formula:
[tex](ab) ^{n} = {a}^{n} {b}^{n} [/tex]
So,
[tex](5 \times 9) ^{12} \\ = {5}^{12} . 9^{12} [/tex]
Also, it will be
[tex] 45^{12} [/tex]
Hope you could understand.
If you have any query, feel free to ask.