A square root
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Radicand
No, you cannot add or subtract under the radical. The radical represents the square root function, and it only operates on the number or expression that is inside the radical. To add or subtract, you need to simplify the expressions inside the radical first.
A radical number is a number with a decimal. so a radical expression would be like 5 raised to the 2.5 power.
The answer depends on the form of the radical expression.
radical expressiona radical expression