Express the final result in a single fraction using positive exponents only in the form of A/B

Question

(12xy^3/-18x^4y)^-3

Answer 1

First simplify the interior of the parentheses: -2y² ÷ 3x³

 

Now, to accommodate the overall (outside exponent, -3), invert that fraction above & cube it.

 

I get -27x⁹ ÷ 8y⁶