Answer:

Explanation:
So we have the expression:

And we want to evaluate it for x=6 and y=-2.
Thus, substitute:

Let's do the numerator first:

Cube the first term and subtract under the radical:

Simplify:

Add:

Now, do the denominator:

Multiply:

Simplify and add:

Remove the absolute value bars:

So, together:

Reduce:

And that's our answer: :)