"Radical x times radical x" could be interpreted as the square root of x times the square root of x - in which case the product would be x (the number under the radical sign)
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12 radical 6 x 6 radical 6 = 72 x 6 = 432
20
2 times radical 5 or about 4.472135955
The product of two square roots, such as √2 x √2, simplifies to the square root of the product of the radicands. In this case, the radicand is 2, so the product simplifies to the square root of 2 x 2, which equals 2. Therefore, √2 x √2 = 2.
√16 x √8 = 4 x 2√2 = 8√2 in radical form or as a decimal = ±11.3137085