is called a variable or a literal constant, or informally an unknown.
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A variable.
X
That is called a variable. A letter is often used.
Is called a variable and is represented by and letter
-The radical is the symbol that represents a square root. -The radicand is the number underneath the radical symbol. -The coefficient is the number out in front of the radical. (We assume that the coefficient multiplies the radical, the same way it would multiply with a variable.)