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\frac{\left(-9x^{3}\right)^{2}}{x^{-4}}
To raise a power to another power, multiply the exponents. Multiply -2 and 2 to get -4.
\frac{\left(-9\right)^{2}\left(x^{3}\right)^{2}}{x^{-4}}
Expand \left(-9x^{3}\right)^{2}.
\frac{\left(-9\right)^{2}x^{6}}{x^{-4}}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
\frac{81x^{6}}{x^{-4}}
Calculate -9 to the power of 2 and get 81.
81x^{10}
To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.
\frac{\left(-9x^{3}\right)^{2}}{x^{-4}}
To raise a power to another power, multiply the exponents. Multiply -2 and 2 to get -4.
\frac{\left(-9\right)^{2}\left(x^{3}\right)^{2}}{x^{-4}}
Expand \left(-9x^{3}\right)^{2}.
\frac{\left(-9\right)^{2}x^{6}}{x^{-4}}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
\frac{81x^{6}}{x^{-4}}
Calculate -9 to the power of 2 and get 81.
81x^{10}
To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.