ok so basically it is WHAADDAAPPP
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That IS the simplest radical form.
radical 15 cannot be simplified.
The radicand is the value under the radical symbol.
4radical7
The square root of 28 or in this case the radical form of 28 will be 2 times radical 7. Since 28 is 4 times 7 and the square root of 4 is two.