Chels.

Radical. Hm. Oddly enough, I think of surfing when I hear that term. Strange.
So, as everybody else has discovered, a radical is a quantity, number, or amount, expressed as a root of another quantity. A radical can obviously be used in math, otherwise we wouldn't be blogging about it.. probably. It can also be used in Chemistry.
Example #1) : the squared root of 225 is 15 because 15x15=225. The radical is 15.. right?
Example #2) : the cubed root of.. 289 is 17! 17x17=289. What the heck? I said cubed root. I meant squared root. Geepers.