How to find zeros using a Ti-83 84 calculator

Welcome to MooMooMath Today I will walk you through how to find zero of a polynomial function.

I will go to y equals on the calculator and put in the function.

I will use the exponent key to put in x^3

I will put in x and the up arrow button for the exponent.

Next I will put in cubed.

I will next put in minus x ^2 and then -5x and finally 2.

I'm using an older calculator and I will redo it with a newer calculator

Before I hit graph I want to check my window.

I use the window at -9.4 and 9.4 on the x axis

I have an older calculator and there are 94 pixels along the window and it gives me friendlier answers.

If you put -10 and positive 10 for your min and max that will be fine.

Use a scale of 1 and the same on the y axis.

Uae a -10 and a positive 10 asyour min and max

You next will hit graph, and you will see the polynomial function.

I need to see where it is crossing the x axis.

Since I created a friendly window I can hit trace and I can use my left and right arrows to move my cursur.

This one is landing on -2,0

Scroll to the right, and the y intersect is crossing at 0,2

and it is crossing the x axis at .2 and .3 so there is probably an irrational number.

The last one crosses between 2 and 2.6 so it is another irrational number.

Now the only integer I have is x =2

So to get the other two I will use my zero key.

I will scroll to the left side and I will use second calc and find my zero.

I will use 2nd then trace because the second function is to calculate.

I will go down to zero and it is asking me for a left boundary.

I want to be on the left side of the zero and it gives me an arrow showing me that.

It will now give me x = .382 if I round it.

Then I will scrollto this one. I will hit trace, get my cursur on the curve and I will find this one.

I'm already on the left side so this time is underneath, I will hit 2nd and calc again.

Go to the zero and hit enter, asking me for the boundaries.

I'm on the let side.

Hit enter and go to the right side and hit enter and it give me an arrow to check my location.

I hit enter a third time and it gives me my zero 2.618

Those are my two zeros.

Now they are irrational and I could find those with sythetic division and the quadratic equation.

However, with a calculator I can just find it following those steps.

That is how you find zeros using a graphing calculator.

This one is a ti83 which is an older version.

I will complete another video on a newer graphing calculator.

It is the same the only difference is how you enter your equation.

-~-~~-~~~-~~-~-

Please watch: "Study Skills Teacher's Secret Guide to your Best Grades"

https://www.youtube.com/watch?v=f3bsg8gaSbw

-~-~~-~~~-~~-~-

Tagged under: polynomials,pre-calculus,calculator, calculator,function,finding zeros,polynomial functions,zeros,graphing

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!

Dr Ayla Göl
@iladylayla

A good tool for supporting active #learning.

The Team Up app is unlike anything I have ever seen. You left NOTHING out! So impressed!