Basic Math – Graphing with a Casio fx-9750GII Calculator

Basic Math – Graphing with a Casio fx-9750GII Calculator


Hello, and welcome to my secret, Math tutor. This video, we’re going to take our Casio FX-9750 GII calculator and get into some basic graphing. Specifically, what I want to cover is how you can start ENTERING EQUATIONS into the calculator and you can ADJUST YOUR WINDOW SIZE, So you get the best picture. And of course how you view that graph and… Start finding some key values or key points on that graph. That’s what we call the TRACE and EVALUATE features of the calculator. So let’s go ahead and jump right into it by grabbing some equations, and of course grabbing our calculators. All right. Let’s go ahead and turn this thing on [now for] graphing features in this particular Casio calculator, you want to go into your Casio menu. Most of time when you’re doing just regular old calculations, you’ll be in the run/Matrix mode. But you want to go into the graphing mode. If you happen to already be in that math mode and you really want to get into the graphing mode then you want to press your menu button first. That’ll bring you to your main menu… Then you can arrow over to the graphing mode. And press execute so that you’re in the graphing mode specifically [alright]? So again, make sure you press your menu button, get into graph, and now you’re ready to start entering in these equations. Okay! So the first one we’re going to enter in is this ‘x cubed minus 2x’, and you’ll notice that it already has the ‘y’s listed in there as ‘y1’ and ‘y2’, so we’ll only enter in the right side of this equation. Let’s use our variable button… so ‘x’… ‘^3-2x’ and I’ll press ENTER and now the equation is stored inside the calculator. Yeah, if I want to adjust the window and get a really good picture of this, the next place I want to go is under the viewing window or ‘V’ window. To get to that I’ll have to press SHIFT and then F3 and make some adjustments. Let’s go and do that. So SHIFT, F3, and… Let’s adjust our window. Now, by default, usually you’ll find that your windows X-Min and X-Max will be between negative 10 and 10 and the same thing will apply to your Y-Min and your Y-Max; it’ll be between negative 10 and 10. For this particular equation, I’m graphing I think it looks best when the X-Min is around -6 and the X-Max is about +6. Let’s type in -6, ENTER, +6, ENTER, and that will adjust my x-values. Now we’ll arrow down over to the y-minimal. So, a y minimum -6, ENTER, and Y-Max, ENTER. Now there’s a lot of other things in here; you’ll notice that there’s a scale feature, it says 1 and that really just means every tick mark you see on the graph represents one unit, so everything looks good. For when you window, let’s go ahead and hit EXIT. And we’re back to our equation where we have it stored in. Now that we’ve adjusted our window, our equation is actually in the calculator let’s go ahead and take a look at what this thing looks like. To get to that you want to go to your draw button, you’ll see it under the menu, and we’ll have to press F6 in order to see this. So, let’s press F6 and it’ll go ahead and they’ll draw out the graph, and it looks really good. So, it’s got a few dips, a few values, but sure enough, this is ‘x cubed minus 2x’. Now, if you want to make some adjustments, or you made a mistake, you can go back to the equation, just press your EXIT button and you’re back at your function menu and then you can either delete it or rewrite it. You know, make some adjustments how you see fit. Now, we’re also going to graph another equation on here, and I’m going to put that under ‘y2’, so this one is the square root of (x-20)… now I have two different graphs. All right, let’s press ENTER and now they’re both stored in the calculator. Like before, I can immediately go to my draw by pressing F6 and it’ll attempt to draw both of these. Now you’ll notice you only see one of them and that’s because the other one is way off the screen. In fact, it doesn’t even start until ‘x=20’. This is another good application of why you want to know how to adjust your window; that way you can see both of them and get a really good picture. So, let’s go ahead and adjust our window by going SHIFT, ‘V’ window, and let’s make some adjustments by setting the X-Max all the way up to 30. That should give us enough x-values that will actually be able to see both of these. All right, so I’m going to press EXIT and press 30 make those adjustments. ENTER so they’re saved… EXIT. Okay now, I’m back to my equations. Let’s press F6 so we can draw them both and there they are. So, here’s the first one, dips and valleys, second one just starts to increase very slowly. Now, if you only want to graph one at a time, you can definitely do that. Again, we make some adjustments back at our equation menu. So, let’s go ahead and press EXIT and let’s go ahead and shut one of these off. You can do that a couple of ways, one way is to just delete the second one out entirely, that’s under F2. So it says ‘Dl’ for delete and then you get the options of whether you want to delete it or not. I’m not going to delete this, I’m going to leave it there or you can actually just tell the calculator “go ahead and keep it, but don’t draw it”, and that’s what the F1 is for. It says ‘SEL’ for select, so I’m going to press ‘SEL’ and the change that its really made is the equal sign is no longer highlighted. Only equations where the equal sign is highlighted will be drawn if we actually graph this thing out. All right, so only the first one is highlighted so that’s the only one we’ll see… Let’s go ahead and press F6, draw out the graph, and sure enough you only see the first one. Alright, so now that we know a little bit more about graphing, let’s adjust our window one more time and let’s reset the X-Max back to 6, ENTER, and get into some of those TRACE or EVALUATION features, okay? So our window is from -6 to +6. Y-Max and Y-Min… -6 to +6, EXIT. Let’s go back into draw. Sure enough, we just have the first equation. Let’s go ahead and start tracing it and evaluating it. To trace it, you’ll press your SHIFT button and then F1, you’ll see it says ‘trace’ right above that button… SHIFT, F1, and now when you move your arrow keys, this little plus sign will start moving along the graph. Below, it’ll tell you where that little plus sign is located. So currently, I have it located at around 1.7. ‘X’ equals 1.7; ‘Y’ equals 1.6. That’s where it’s located. They’ll also tell you in the upper left what equation it’s on. So right now, it’s on the ‘x cubed minus 2x’ equation. If you want to evaluate this at a specific value, a good way to do that is actually just type in the x-value and it will jump to that one. So, for example, maybe I really want to know what it’s doing at -1. So I’ll type in, -1, and you’ll notice that it automatically brings up this ENTER X-VALUE screen; it knows that we’re trying to type in an x-value. So, ‘x=-1’… I’ll press EXECUTE and you immediately jump to ‘x=-1’ and give me the corresponding y-coordinate. So I know where it is on the graph, I know it’s x and y-coordinate; looks pretty good. Let’s do this again and type in ‘x=2’ and see where that is. So, I don’t really have to do anything other than just press 2. It knows I’m putting in an x-value and it looks great. Press EXECUTE and sure enough, now it’s jumped way up to here. That’s at the point (2,4). Nice. Alright, so hopefully that gives you some of the basics of how you enter in an equation. You can always get back to that menu screen if you want to get back to some regular calculations. You’ll just go to your menu screen, but that’s how you get to the graphing portion of this thing. Right, if you’d like to see some more videos, please visit mysecretmathtutor.com…

100 thoughts to “Basic Math – Graphing with a Casio fx-9750GII Calculator”

  1. i did exactly as you instructed in the video, but every time i try to draw the equation all i see is a vertical line in the middle of the screen… any fixes/tips?

  2. This tutorial can apply to the fx 9860 GII as well, and the fx CG 10 & 20 series by the looks of it, as Casio have maintained a consistent screen menu and key function layout in all these calculators.

  3. im in a statistics class where i needed a graphing calculator, so I chose this one. I am watching this to learn how to use it. when I did the graph you demonstrated, it brought up the right shape I guess you could call it, however, that is all thats there. there is no like actual graph, like the x and y axis, tick marks, etc. please help. thanks!

  4. Hi!

    My fractions come out as this little sign , like a small inverted L. I want my fractions to show like traditional fractions ( like a number / number ) .
    Just cannot figure out how to change the setting to make it show the fractions like that.

    Any ideas?

  5. why does my graph look different when i type it in…
    and why was your x values 10, -10 and mine were 6.3, -6.3

  6. is there any way to get this thing to actually show the work? I thought it would when I purchased it, as a friend's comparable TI does, but after testing it , it doesn't seem to do this. without actually showing work, only an answer, it's pretty much useless.

  7. when your changing the view window, how do you know what number is best to put to get a better look on your graph?

  8. I could never figure out how to get more than one value under the square root on this calculator. It makes sense that you have to do put the values in parentheses so that the calculator knows what is under and what is not under the radical. I find that this trick also works when making rational/fractional expressions. (x=2),x rather than simply x+2,x . Thank you so much!! If anyone knows how I can get this calculator to give me a decimal rather than simplest radical form(ie get the decimal value of 2radical3) that would be much appreciated! I have tried using the fraction to decimal hot key but it does not change it. Thanks!!

  9. Hi, there is something happened with my calculator, I think its option has changed , it doesn’t work x . When press x its always shows t, could you please reply to this

  10. I think we need a Love button here.  I too was getting a syntax error notice, but erased everything and started from scratch and it all worked out.  Thanks for your guidance!

  11. Hi all the settings are same and the type-ins are also same but it says syntax error. What is wrong with my calculator?

  12. everything works perfectly except typing values to see them specifically ! i'm using Casio fx-9750G not 11

  13. Thank you so much, my first time using a graphing calculator and I was so lost! I appreciate the help!

  14. can you let me know how I put my fx-9750GII calculator in exam mode? I have my s1 exam tomorrow and I don't know how to enter exam mode, will the invigilators come and do it for me?

  15. Hello. I’m looking for a calculator and I really don’t want to spend $90 bucks. I’m a freshman and I’m a nursing major. Will this do the job?

  16. Thanks it was a big help, but in Asian countries we do not use calculators and overseas or abroad if u don't know how to use a calculator then u clearly don't know how the calculous works. Which is very different from asian countries in Asian countries if u use calculators then It means that u are cheating.

  17. Let''s say that I'm doing (squareroot of 3)/(squareroot of 5). How do I get the result in fraction form that is (squareroot of 15)/5 instead of 0.77????

  18. with this calculator cant find how to get domain and range from a function any video made? thanks for this one helpful

  19. thank you so much! my teacher went over functions today but he used a texas instrument graphing calculator, so i was left a little confused at times. do you know how i would be able to solve direct x and y intercepts using the calculator? like how do we find zeros? and i know we can enter a specific x value to find, but can we enter a specific y value? thanks!

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