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The rule to keep in mind to questions like this is:

an × bn = (a × b)n

In the case of square roots, the exponent "n" would be one half, so we can say:

21/2 × 151/2 = (2 × 15)1/2 = 301/2 ≡ √30 ≈ 5.477226

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Q: What is the answer to square root 2 times the square root 15?
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