College Algebra Help

[Insider2000]

I am having a horrible time trying to solve this last question.

Ignore the (A/B), I just need to rationalize this.

I know you have to move values with negative exponants, but if that were the case, wouldn't the numerator end up being "y^4"? Apparently, that's wrong.

Assistance would be greatly appreciated.

[Malintex_Terek]

Can you split up the numerator because the denominator is the same?

[Insider2000]

As in make it:

-4x^-15/(denominator) - (4x^-15/(denominator))

?

It seems possible. I'll give it a try.