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Square Root

Tool to compute and simplify a square root. The square root for a number N, is the number noted sqrt(N) that, multiplied by itself, equals N.

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Square Root -

Tag(s) : Symbolic Computation, Functions

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Square Root

Square Root Calculator





See also: Cube RootCalculator

Expression with Square Root Simplification






Batch Square Root Computation


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See also: Cube RootCalculator

Answers to Questions (FAQ)

What is a square root? (Definition)

A square root of $ x $ (or radical of $ x $) is a mathematical concept noted $ \sqrt{x} $ (ou sqrt(x)) that refers to the number that, when multiplied by itself, produces the number $ x $.

Example: The square root of $ 9 $ is $ 3 $ that is written $ \sqrt{9} = 3 $, because $ 3 \times 3 = 9 $

The square root function, denoted always returns the principal (positive) root. Mathematically, the equation $ y^2 = x $ has two solutions for $ x $, one positive and one negative, so $ x = \pm \sqrt{y} $

How to calculate a square root?

There are several methods to calculate a root square.

— By hand framing: the classic method is to estimate the value by calculating which integers squared would give a minimum interval.

Example: Enclosing $ \sqrt{8} $: $ 2^2 = 4 < 8 < 9 = 3^3 $ so $ 2 < \sqrt{8} < 3 $, it is then possible to enclose the first digit after the comma: $ 2.8^2 < 8 < 2.9^2 $ etc.

— By extraction of squares: if the number under the root is factorized with squares, then it is possible to extract them from the root.

Example: Factorization of $ \sqrt{8} = \sqrt{ 4 \times 2 } = \sqrt{ 2^2 \times 2 } = 2 \sqrt{2} $. Since $ \sqrt{2} \approx 1.414 $, then $ \sqrt{8} \approx 2.828 $

— With a square root calculator like this one from dCode:

Enter a positive or negative number (in this case, it will have complex roots).

Choose the format of the result, either an exact value (if it is an integer or variables) or approximate (decimal number with adjustable precision by defining a minimum number of significant digits)

Example: $ \sqrt{12} = 2 \sqrt{3} \approx 3.464 $

Example: $ \sqrt{-1} = i $ (complex root)

What are square root properties?

For any real number $ a \in \mathbb{R} $

$$ \sqrt{a^2} = |a| $$

For any positive real number $ a \in \mathbb{R}_+ $

$$ \sqrt{a^2} = a \\ \left( \sqrt{a} \right)^2 = a $$

For any number $ b $

$$ \sqrt{a \times b} = \sqrt{a} \times \sqrt{b} \\ \sqrt{ \frac{a}{b} } = \frac{\sqrt{a}}{\sqrt{b}} \qquad (b \neq 0) \\ \sqrt{a^2 \times b} = |a| \sqrt{b} $$

The square root of a perfect square is an integer.

How to simplify a square root?

The simplification of a square root generally passes by the factorization of the component under the root by one or more squares.

Example: $ \sqrt{20} = \sqrt{ 2^2 \times 5 } = \sqrt{ 2^2 } \times \sqrt{ 5 } = 2 \sqrt{ 5 } $

Use the prime factors decomposition if necessary

How to simplify a fraction with square root?

If the denominator is a radical, then multiply the numerator and the denominator by it to make it disappear.

$$\frac{a}{\sqrt{b}} = \frac{a\sqrt{b}}{\sqrt{b}^2} = \frac{a\sqrt{b}}{b} $$

If the denominator is an addition or subtraction of roots, then apply the remarkable identity: $ (a+b)(a-b) = a^2-b^2 $

$$ \frac{a}{\sqrt{b}+\sqrt{c}} = \frac{a(\sqrt{b}-\sqrt{c})}{(\sqrt{b}+\sqrt{c})(\sqrt{b}-\sqrt{c})} = \frac{a\sqrt{b}-a\sqrt{c}}{b-c} $$

$$ \frac{a}{\sqrt{b}-\sqrt{c}} = \frac{a(\sqrt{b}+\sqrt{c})}{(\sqrt{b}-\sqrt{c})(\sqrt{b}+\sqrt{c})} = \frac{a\sqrt{b}+a\sqrt{c}}{b-c} $$

How to write a square root?

In Unicode format there is the character (U+221A).

In computer formulas, sqrt() function is most often used.

Exponentiation by the value $ 1/2 $ is also common: $ \sqrt{x} = x^{1/2} $ (exponent 0.5)

Terms root, radix ou radicand sont équivalents.

Why calculate square roots?

Square roots are needed in many areas of mathematics.

Example: In algebra: in algebraic calculations, the roots are used to solve polynomial equations of the type $ x^2 + 2x + 1 = 0 $

Example: In geometry: in length calculations (or vector norms), roots are used to find solutions to the Pythagorean theorem $ a^2 + b^2 = c^2 $

What does sqrt mean?

The word sqrt is generally used in the formula to indicate a square root, the word comes from the contraction of square root.

Example: sqrt(2) = $ \sqrt{2} $

What is a square number?

A square number is the square of an integer.

Example: $ 3 $ is an integer, $ 3^2 = 3 \times 3 = 9 $ then $ 9 $ is a square number.

If the square root of a number $ x $ is an integer, then $ x $ is a square number.

What is the square root of a negative number?

The square root of a negative number is not a real number. It belongs to the complex numbers and is written in the form $ i \sqrt{|a|} $, where $ i $ is the imaginary unit, defined by $ i^2 = -1 $.

What is the square root of 0 (zero)? and 1 (one)?

The square root of zero is zero, because $ 0 \times 0 = 0 $

The square root of one is one, because $ 1 \times 1 = 1 $

Source code

dCode retains ownership of the "Square Root" source code. Except explicit open source licence (indicated Creative Commons / free), the "Square Root" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Square Root" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Square Root" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
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Square Root on dCode.fr [online website], retrieved on 2024-12-03, https://www.dcode.fr/square-root

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