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Not necessarily. If it is the same radical number, then the signs cancel out. Radical 5 times radical 5 equals 5. But if they are different, then you multiply the numbers and leave them under the radical sign. Example: radical 5 * radical 6 = radical 30
Sqrt[5*radical(68)] = -6.4211 and +6.4211.
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radical 30
It is sqrt[100*sqrt(2)] = 10*fourth root of 2.