According to Wikipedia, article on "Square root": "The symbol '√' for the square root was first used in print in 1525 in Christoph Rudolff's Coss, which was also the first to use the then-new signs '+' and '−'."
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That symbol is called the radical.
The radicand is the value under the radical symbol.
The radical form is the use of the check mark like symbol. The square root of 297 should look like 297 = 17.2336879 or 17.2336879 x 17.2336879 = 297
Radical (3x) = radical(x) * radical(3).
-3*radical(2)*radical(50) = -3*radical(2*50) = -3*radical(100) = -3*10 = -30