# How to Use Sigma Notation/Summation on Ti-84 Graphing Calculator3 min read

Sigma notation is used to solve the sum of functions It usually took hours to evaluate these sums by hand. The ti-84 graphing calculator has made it easier for its users to evaluate these sums in less than a minute. The Ti-84 calculator now comes with its enhanced features including â€˜sumâ€™, â€˜seriesâ€™, â€™sequenceâ€™(seq), memory archive, etc

This time-efficient device enables its users to avoid hassles that come during the evaluation of complex functions. Letâ€™s discuss the steps to be followed for effectively dealing with these functions.

Contents

## How to do Sigma Notation on Ti-84 Calculator

The summation of Ti-84 is simple, all you need is to follow the steps below:

### Step 1: Opt for Summation Notation.

Summation notation or sigma option is present in the (math) menu of your Ti-84.

• Press math.
• Scroll down until you reach the â€˜summationâ€™ option.
• Press enter.
• A summation notation Ti-84 template will be displayed.

### Step 2: Assigning the variable and limits

• Start inserting the sequence of the required values. the cursor will automatically switch to the next box to be filled.
• Start with assigning the variable which may be as per your desire (x,y, a, or any other).
• Note that only a single letter will be accepted as a variable.
• Now Assign the upper and lower limits.
• Use arrow keys to navigate and mention the upper and lower limit of the function.

Note: Lower limit will be written below the sigma notation while the upper limit will be written on top of the sigma notation.

Here’s a complete video tutorial on how to do summation notation on Ti-84

### Step 3: Filling out the required boxes

Now you need to put the function inside the parenthesis brackets.

For example.

• write 2 inside parenthesis.
• start parenthesis again and assign a variable(x in this case) of your choice.
• insert mathematical operation (+,_).
• close the parenthesis.
• square it using the symbol.

Now, Press Enter only when you have filled out all the boxes .pressing enter with any box unfilled will leads to an error.

## How to Do Summation Notation When Your Calculator lacks a sigma function?

The sequence function â€˜seqâ€™ can be used in order to find out the sum of a function.

To make this function work you need to follow these steps ;

• Press 2nd, then press â€˜STATâ€™.this will allow you to enter the math menu.
• Select â€˜sumâ€™ from this menu.
• Select â€˜seqâ€™/sequence function .
• Press enter and it will return the result.

## FAQs

### Q: Is Ti 84 capable of solving infinity sums?

The device is designed to work on convergent values only .which means that a finite number of values can finely be solved using this function.

### Q: What is the alternate function available for summation?

If your device doesnâ€™t have the summation feature you can evaluate it using the sequence â€˜seqâ€™ function. Press 2nd STAT and enter into the MATH menu,Â  select sum, and then click on the â€˜seqâ€™ function. Now, press ENTER to evaluate it.

### Q: How many variables can be assigned to do sigma on the Ti-84 calculator?

The Ti 84 calculator works on a single variable at a time.