used to indicate a root is called a radical and is therefore read “x radical n,” or “the nth root of x.” In the radical symbol, the horizontal line is called the vinculum, the quantity under the vinculum is called the radicand, and the quantity n written to the left is called the index.

### What is the index in the radical expression?

The index is the number above the root symbol in a radical expression. This image shows a radical expression with the index and radicand labelled.

Where is the index written in a radical expression?

Radical symbol: the symbol that looks like a check mark with an elongated horizontal line stuck to the end of it. Index: the small number tucked inside the check mark portion of the radical sign; in the expression ab, a is the index.

How do you find the index of a radical?

1. Isolate the radical on one side of the equation.
2. Raise both sides of the equation to the power of the index.
3. Solve the new equation.
4. Check the answer in the original equation.

## How do you solve a radical expression?

1. Isolate the radical expression involving the variable.
2. Raise both sides of the equation to the index of the radical.
3. If there is still a radical equation, repeat steps 1 and 2; otherwise, solve the resulting equation and check the answer in the original equation.

Radicals – Definition The symbol is called the radical symbol. Technically, just the check mark part of the symbol is the radical; the line across the top is called the vinculum. The expression is read as “root nine”, “radical nine”, or “the square root of nine”.

What are the four steps in solving radical equations?

2. Square both sides of the equation: If x=y then x2=y2 x 2 = y 2 .
3. Once the radical is removed, solve for the unknown.

How do we simplify radicals with different index?

To simplify two radicals with different roots, we first rewrite the roots as rational exponents. Before the terms can be multiplied together, we change the exponents so they have a common denominator. By doing this, the bases now have the same roots and their terms can be multiplied together.

## When to use the calinski-harabasz ( ch ) index?

Calinski-Harabasz Index: Calinski-Harabasz (CH) Index (introduced by Calinski and Harabasz in 1974) can be used to evaluate the model when ground truth labels are not known where the validation of how well the clustering has been done is made using quantities and features inherent to the dataset.

### What is the variance ratio of the calinski harabasz criterion?

Calinski-Harabasz Criterion. The Calinski-Harabasz criterion is sometimes called the variance ratio criterion (VRC). where SS B is the overall between-cluster variance, SS W is the overall within-cluster variance, k is the number of clusters, and N is the number of observations.

Which is better Dunn or calinski harabasz?

Calinski-Harabasz, Davies-Bouldin, Dunn and Silhouette perform well in a wide range of situations. Performance based on average intra and inter-cluster SSE (Tr):

How to specify a clustering algorithm for calinski-harabasz criterion?

If criterion is ‘CalinskiHarabasz’ , ‘DaviesBouldin’, or ‘silhouette’, you can specify a clustering algorithm using a function handle (MATLAB). The function must be of the form C = clustfun (DATA,K), where DATA is the data to be clustered, and K is the number of clusters.