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In math, the 6th root b of a number a is such that b6 = a. By definition, when you multiply b by itself 6 times you get the value of a.
A 6-th root is usually denoted 6√x, but it can also be written in exponential form with the base x and the exponent 1/6: x^1/6 or x1/6.
Read on to learn everything about these numbers, including the properties, and make sure to check out our calculator.
If you happen to know exponentiation, then you can think of the 6th root of a number as the inverse operation to elevating a number to the power of 6.
Whereas in exponentiation elevating a number a to the power of 6 is defined as a6 = b, the 6th root b is defined as b = a1/6.
For example with a = 262144 we get:
In other words, the 6th root of 262144 is 8, because 8 times 8 times 8 times 8 times 8 times 8 is 262144.
Keep reading to learn an important property of the sixth root.
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If the index n of a root is is even, such as in the case here with n = 6, then every positive number
The positive is also known as principal 6th root
and the negative 6th root
Together, they are written as
Let’s have a look at this example:
-46 = 4096
46 = 4096
The positive root is always the principal.
Next, we explain how the parts are called. Keep reading to learn all about the topic.
As depicted, the parts of the sixth root are:
The radix sign, which tells us that it is a mathematical root, and the index of 6, which tells us that it is the 6-th root.
The number below the radix, x, is the radicand.
The result of the mathematical operation is denoted by the equal sign and called the root.
6th Root Symbol
The symbol √ is called radical sign, or radix.
Ahead is our calculator.
About our 6th Root Calculator
Our calculator at the top of this page computes the sixth root of any non-negative real number.
Just enter a valid radicand; you then automatically obtain both, the principal root as well as the negative result.
If this app has been of use to you bookmark it now.
Next, we discuss the properties.
6th Root Properties
= -a if a < 0 and a if ≥ 0
The most important property is the first; the negative number tends to be forgotten. Read on to see the examples:
6th Root Examples
We use the list of properties above to show you some examples in the order of appearance:
Frequently searched terms on this site include:
6th Root in Excel
In Excel you enter the syntax for
in a cell, like this:
For example, to calculate
In the next section we explain how to do the math.
How to Calculate the 6th Root
A very efficient procedure for extracting the sixth root is the Newton–Raphson method, also known as Newton’s method detailed below:
You begin with a guessed starting value and then iterate the steps until you’re happy with the precision.
In the most basic version of the method, f is a single-variable function and f′ its derivative.
You may think of it as the 6th root formula.
Table of Sixth Roots
Ahead is the bottom line.
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Note that you can find the value of many 6th roots by using the search form in the header menu.
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