This is not possible if both numbers are whole numbers.
The larger number would be
(20+15)/2 = 17.5
The smaller number would be
(20-15)/2=2.5
So they cannot be whole numbers.
You know
Squaring both sides gives
Then raising both sides to any integer power 
gives
That is, any power of 
where the power is a multiple of 4 will always be equal to 1.
So
But perhaps you mean to write 20+1 as the exponent, in which case
(8/-4) / (-3/9)=
(8/-4) * (9/3)=
72/-12=
-6
Answer:
My brain just exploded. I tried imagining what the shape would look like, and that didn't work. Also, I tried drawing the shape and that didn't work. I have no idea what the shape looks like. If you still need help with this question, maybe you can repost it with an image attached so we can know what the shape looks like.
