To evaluate the expression \(\sqrt{100}\), you can follow these steps:
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Understand the square root: The square root of a number \(x\) is a number \(y\) such that \(y^2 = x\). In this case, we want to find \(y\) such that \(y^2 = 100\).
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Find the square root of 100:
- You can think of the numbers whose squares are 100.
- \(10^2 = 100\) and \((-10)^2 = 100\).
- Therefore, the positive square root of 100 is 10, and it also has a negative counterpart, but in the context of real numbers, we typically refer to the principal (positive) square root.
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Conclusion:
- Since \(\sqrt{100} = 10\), this is a real number.
Given this, the correct choice is A.
So, we can fill the answer box as follows:
A. The expression is a real number. \(\sqrt{100} = 10\)