Question 26486
You need to remember, a negative exponents turn integers into fractions". If they are already in fraction, it makes them a numerator.
{{{(((-4)(x^4)(y^-2))/((5)(x^-1)(y^4)))^-4}}}
First distribute the -4;
{{{16x^4y^-2/-20x^-1y^4}}}
Now just switch the negative exponents;
{{{16x^4x^1/-20y^2y^4}}}
simplfy and add like terms;
-{{{4x^5/5y^6}}}
Hope you understand
=)