Christoff Rudolff
The radical symbol first appeared in 1525 in Die Coss by Christoff Rudolff (1499-1545). He used the symbol (without the vinculum) for square roots.
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It was invented, not discovered.
it's called the radical sign
Yes.
"Radical x times radical x" could be interpreted as the square root of x times the square root of x - in which case the product would be x (the number under the radical sign)
Square both sides of the equation to get rid of the radical sign. Then just solve as you normally would. Good luck! :-)