In math, the 5th root b of a number a is such that b5 = a. By definition, when you multiply b by itself 5 times you get the value of a.
A 5-th root is usually denoted 5√x, but it can also be written in exponential form with the base x and the exponent 1/5: x^1/5 or x1/5.
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 5th root of a number as the inverse operation to elevating a number to the power of 5.
Whereas in exponentiation elevating a number a to the power of 5 is defined as a5 = b, the 5th root b is defined as b = a1/5.
For example with a = 7776 we get:
In other words, the 5th root of 7776 is 6, because 6 times 6 times 6 times 6 times 6 is 7776.
As the index n (5) is odd, 5 is the only real 5th root.
You may be interested what happens if the nth Root index n of a root is is even.
Keep reading to learn everything about the fifth root.
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Next, we explain how the parts are called. Keep reading to learn all about the topic.
As depicted, the parts of the fifth root are:
The radix sign, which tells us that it is a mathematical root, and the index of 5, which tells us that it is the 5-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.
5th Root Symbol
The symbol √ is called radical sign, or radix.
Ahead is our calculator.
5th Root Calculator
Our calculator above computes the fifth root of any non-negative real number.
Just enter a valid radicand; you then automatically obtain the result.
If this app has been of use to you bookmark it now.
Next, we discuss the properties.
5th 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:
5th 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:
5th 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 5th Root
A very efficient procedure for extracting the fifth 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 5th root formula.
Next are frequently asked questions in the context of this article.
Click on the question which is of interest to you to see the collapsible content answer.
What is the 5th Root Called?
How Do You Type a 5th Root on a Computer?
How Do You do 5th Roots on a Calculator?
Table of Fifth Roots
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