# How do you use the laws of exponents to simplify the expression (-3xy^3)^4?

One law of the exponents states that ${\left({a}^{n}\right)}^{m} = {a}^{n \cdot m}$
${\left(- 3\right)}^{4} \cdot {\left(x\right)}^{4} \cdot {\left({y}^{3}\right)}^{4} = 81 {x}^{4} {y}^{12}$