Answer
$\dfrac{1}{x^{3}y^4}$
Work Step by Step
Using the laws of exponents, the given expression, $
(x^3y^4)^{-1}
,$ is equivalent to
\begin{array}{l}\require{cancel}
x^{3(-1)}y^{4(-1)}
\\\\=
x^{-3}y^{-4}
\\\\=
\dfrac{1}{x^{3}y^4}
.\end{array}
For more complicated problems, it is helpful to remember that you can flip the location of numbers with negative exponents. In other words, you can move numbers with a negative exponent that are in the numerator to the denominator, and you can move numbers with a negative exponent in the denominator to the numerator.
