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Learn about the square root symbol (the principal root) and what it means to find a square root. Also learn how to solve simple square root equations.
- Understanding Square Roots
A square root is a number that when multiplied by itself...
- Understanding Square Roots
In mathematics, a square root of a number x is a number y such that ; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. [1] For example, 4 and −4 are square roots of 16 because .
A square root is a number that when multiplied by itself makes a specified quantity. For example 3, when 3 is multiplied by itself (3*3) it equals 9, thus making 3, the square root of 9.
- 1 min
- Sal Khan,Monterey Institute for Technology and Education
In mathematics, a square root function is defined as a one-to-one function that takes a positive number as an input and returns the square root of the given input number. f (x) = √x. For example, if x=4, then the function returns the output value as 2.
The square root of a number \(a\), denoted \(\sqrt{a}\), is the number \(b\) such that \[b^{2} = a\text{ and }b\ge 0.\] The square root symbol "\(\sqrt{\ }\)" is also sometimes called a radical. The number or expression underneath the top line of the square root symbol is called the radicand.
There is a fun method for calculating a square root that gets more and more accurate each time around: a) start with a guess (let's guess 4 is the square root of 10) b) divide by the guess (10/4 = 2.5)
Definition. Here is the definition: A square root of x is a number r whose square is x: r 2 = x. The Square Root Symbol. This is the special symbol that means "square root", it is like a tick, and actually started hundreds of years ago as a dot with a flick upwards. It is called the radical, and always makes mathematics look important!
