In mathematics, a square root of a number a is a number y such that y = a, or, in other words, a number y whose square (the result of multiplying the number by itself, or y × y) is a. For example, 4 is a square root of 16 because 4 = 16.
Every non-negative real number a has a unique non-negative square root, called the principal square root, which is denoted by , where is called radical sign. For example, the principal square root of 9 is 3, deno...
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In mathematics, a square root of a number a is a number y such that y = a, or, in other words, a number y whose square (the result of multiplying the number by itself, or y × y) is a. For example, 4 is a square root of 16 because 4 = 16.
Every non-negative real number a has a unique non-negative square root, called the principal square root, which is denoted by , where is called radical sign. For example, the principal square root of 9 is 3, denoted , because 3 = 3 × 3 = 9 and 3 is non-negative. The term whose root is being considered is known as the radicand. The radicand is the number or expression underneath the radical sign, in this example 9.
Every positive number a has two square roots: , which is positive, and , which is negative. Together, these two roots are denoted (see ± shorthand). Although the principal square root of a positive number is only one of its two square roots, the designation "the square root" is often used to refer to the principal square root. For positive...
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