Explore what happens when you try to find the square root, cube root and fourth root of -1. Discover that it is possible to find odd roots of negative numbers but not even roots.
23 means 2x2x2. 22 means 2x2. 21 means 2. But what about 20 or 2-1 or 2-2. Explore what happens when you follow patterns past zero and discover how negative powers work.