There is no exact answer because it is irrational.
It is approximately 42.42
For an answer with more significant figures, ask your calculator for square root(1800).
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Two times the square root of 15 is the square root of 60. This is not a perfect square so we can only approximate it. It is about 7.75. Numbers such as 2 times the square root of 15 are known as irrational numbers since they cannot be written as a ratio or fraction.
2 times root 2= 2x2x2 = 8
Well, honey, root 2 times root 6 is the same as the square root of 12, which simplifies to 2 times the square root of 3. So, in a nutshell, root 2 times root 6 equals 2 root 3. Math can be a real hoot, can't it?
Oh, what a happy little math problem we have here! When you have 3 times the square root of 2 minus 1 times the square root of 2, you can combine like terms. So, 3 root 2 minus root 2 is equal to 2 times the square root of 2. Just like that, we've created a beautiful, simplified expression.
root 6