Answer: 1/(16^13)
Step-by-step explanation: Another way of rewriting this would be
(8 - xy + x)^(2-3y). Plugging in numbers, this results to
[8 - (-2)(5) + (-2)]^[2 - 3(5)]
which can then be simplified to
(8+10-2)^(-13) = 16^(-13) = 1/(16^13) which has a pretty big number in the denominator