5*root(21^2) = 5*21 = 105
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5 squared is 25, and 6 squared is 36.Because 31 lies between 25 and 36, the square root of 31 lies between 5 and 6.
Well, isn't that a happy little math problem! The square root of 5 squared is 5, and the square root of 4 squared is 4. So, when you subtract 4 squared from 5 squared, you get 9. Remember, there are no mistakes in math, just happy little accidents!
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To simplify the square root of 5 times the square root of 6, you can multiply the two square roots together. This gives you the square root of (5*6), which simplifies to the square root of 30. Therefore, the simplified answer is the square root of 30.