The square root of a square root is the 4th root of a number, & the square root of that is the 8th root, & the square root of that is the 16th root, etc. As pictured above, another number can substitute for 2 on the radical signs, like 3 as in this example; the cube root of a cube root is the 9th root of a number, & the cube root of that is the 27th root, & the cube root of that is the 81st root, etc. It's exponential!
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© Derek Cumberbatch