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  • https://math.libretexts.org/Courses/Grayson_College/Prealgebra/Book%3A_Prealgebra_(OpenStax)/05%3A_Decimals/5.12%3A_Simplify_and_Use_Square_Roots_(Part_1)
    If m is the square of n, then n is the square root of m and m is the product of a number n multiplied by itself. If n is a whole number, then m is a perfect square. Any positive number squared is posi...If m is the square of n, then n is the square root of m and m is the product of a number n multiplied by itself. If n is a whole number, then m is a perfect square. Any positive number squared is positive, and any negative number squared is also positive. When using the order of operations to simplify an expression that has square roots, we treat the radical sign as a grouping symbol. The radical sign stands for the positive square root, which is also called the principal square root.

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