(64)^(-1/2)-(-32)^(-4/5)
=1/8 - ((-32)^(1/5))^(-4)
=1/8 - (-2)^(-4)
=1/8 - 1/16
=1/16
when you give your post a subject title it is better to use a more descriiptive one.
That way people can find your posts more easily. Or maybe use your post to help answer their own questions.
Plus, when I am answering I'll often scan through for interesting looking subjects and answer them first.
Just a suggestion.
+118653 
