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Best Answer
21/2 = √2 ≈ 1.414
The rules of indices are that when multiplying add them.
21/2 x 21/2 = 21/2 + 1/2 = 21 = 2
So multiplying 21/2 by itself gives 2.
But what number multiplied by itself gives 2?
The answer is the square root of 2.
Thus 21/2 is the square root of 2.
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