okay
Mr. Tarrou here again. I am going to redo the video I just published cuz I realize
you could hardly see the screen and you couldn't use see my cursor so I
made it bigger
and zoomed in a bit more on this calculator. okay
so how do you do just some basic graphing
with a TI Nspire. It does not does need to be color
does not be CAS. They all work pretty much the same way that the touchpad
so let's make a parabola, find a relative minimum
find the X intercepts and shaded as the word inequality
so the yes some understanding of how to do some basic graphing
with this calculator. I am just going to do a scratchpad
graph. Because I don't intend on saving this. You could do new documents and make
one if you like.
So you can start a graph by choosing
this and everywhere you see my cursory move, you would be putting your finger
over this touchpad and to select your push the center and make it click
to make your selection process. It is a little bit cumbersome to do this
though with the simulated calculator. So I am going to move my cursor around But, every time I
click something you were touching the center this touchpad making it click.
You can choose to put the cursor over b
and hit the center. You can hit the toggle button which is the easiest way to
do this
Umm, and when you hit this button it will scroll through the scratchpad
calculator which is there
and the touch pad graphing. I want this calculator to looklike it does when you
first buy it.
So I am going to hit menu, hit zoom, hit standard
and now your window is at your negative 10 positive 10 window like it would be
when you bought it.
Let's hit this button right here, show entry line.
Type in X squared minus seven x
minus eight
and see what that parabola looks like by hitting enter.
We have a parabola whose vertex is off the bottom of the scree. I want to show
you how to make
relative minimum and not be able to do that
if you can't see the bottom of the screen and there's two ways to adjust
the window size.
You can hit the menu button and choose zoom
and just, there's a lot of options, but I am going to hit window settings
and make the y min negative 20 and just by hitting the delete button, this
might all be highlighted on your calculator of you try it,
and make the y min negative 20 and hit enter.
We can just about see the bottom of this parabola, so what I want to do is
come on this axis you would hit the center button and hold it till then
closes I'm going to click and drag it
I'll in actually shrink the scale look you can actually see the problem
stricken up into the screen
on this label is gonna be in the way so you can put your cursor over this label
hold the center of the touch pad button
I'm gonna click and drag it over anywhere you like once the hand closes,
see where it closed? That shows you can grab something move it around. Okay let's find
the relative minimum this parabola which is the vertex
you do that by hitting menu and
and analyzed and then choose relative min or max. This is the bottom so it will be min
and now its asking you for the lower bound. You will move your hand over the
touchpad
and draw the line to the left or drag the line to left of the minimum
hit the center of your touchpad and make click
and it'll change to upper bound. Move your finger the to the right, move it over
and you can see it's already highlighting the minimum value
clip the center of your touchpad and voila! You have the vertex or relative minimum of this
parabola. Would you like an x intercepts?
well it menu, hit da
analyze and zero
x intercept, solution, or roots
they all mean the same thing. They are x intercepts. Lets choose the
0 and put the cursor to the...or move the line and keep it to the left
of the
x intercept, touch your touchpad in the middle
click it. Move your finger the right, the center the touchpad again and BAM!
there is the x intercepts and you can click and drag these
uh labels around if you like to make this easier to read. That's a graph a problem that's a
change the Windows sending
and that is how you I'll find the
relative minimum and x intercepted of a parabola or any other graph for that
matter
You can also if you don't like where the window is you can and
this is sometimes fiddly to get figured out, but you can click and drag in
the center of your
window, and oooh, there you go. Do you see the crunches down and you can
move that window
anywhere you like and you can see the scales changes as well.
You can shade a parabola
or any other line that matter like an inequality I going to hit
the show entry line. I'm going to hit up
and I am going to back up and put the cursor in front of the equal sign. If I hit Delete
it'll ask me haha, would you like to graph an equality? How about greater than
alright hit enter. BAM! There it is shaded up
and you can even see the dotted lines above the graph or on the graph because
is greater. You can umm
hits menu, or excuse me the entry line
and you can go back up to
to the first-line where the
graphing is and with your cursor put the
uhmm, with your
track pad put the cursor right next to the greater than symbol
hit delete and now you can do greater than or equal to
that's gonna make line solid after an answer
and so unlike an 83 84, with inspire you can shade
and you can show the line properly based on the inequality symbol.
So that is shading and drawning inequalities with a TI Nspire.
If you want to delete this graph you can select it
and hit control menu and get all kinds a nice things you might want to do. One of
them is delete
and there screen is clear. Now with you doing any quality
it moves off the function line, so if I arrow up, I'm still going to see f1.
To delete that, back up to the equal sign, don't go under the equal sign just back
up to it,
and enter and bada bing bada boom, your screen is empty and everything's ready
to go.
That is basic graphing and finding relative mins and max and
x intercepts with a TI SPIRE. If there's anything else you wanna know what to do
with these
please send me a message and I'll shoot you a video, I'll post a video to help you
figure out how to do that
thanks very much for watching, Mr. Tarrou is out!