Graphing Calculator Issue?

[wrongnmbr]

Okay, so I'm trying to find the domain for this function: f(x) = ?(15-x)

When I try to insert this problem into my TI-83 graphing calculator (y= --> (15-x) --> 2nd --> graph) I get far larger numbers (-141.8, etc.) than I'm supposed to.

Are my settings causing this? And if so, how do I adjust these settings to get the correct domain?

Also, when I try to graph it says ERR: WINDOW RANGE...

PS: It gives me that same error when I try to graph anything...

 

[mmm4444bot]

I'm trying to find the domain for this function: f(x) = ?(15-x)

I try to insert this problem into my TI-83 graphing alculator (y= --> (15-x) --> 2nd --> graph)

The expressions in red above are not the same. What is the function in this exercise ?

I'm also thinking that the TI-83 model has no built-in feature to display the domain of expressions in the Y= list.

Why don't you just calculate the domain by hand ?



Also, when I try to graph it says ERR: WINDOW RANGE...

PS: It gives me that same error when I try to graph anything...

Perhaps, you have entered values such that xMAX < xMIN, or maybe yMAX < yMIN.

Please tell me the values that you entered for the window-setting variables above.

 

[wrongnmbr]

Re:

I'm also thinking that the TI-83 model has no built-in feature to display the domain of expressions in the Y= list.

It does. My professor found the domain of expressions using the same model.

Perhaps, you have entered values such that xMAX < xMIN, or maybe yMAX < yMIN.

Please tell me the values that you entered for the window-setting variables above.

Xmin = 100
Xmax = 100
Xscl = 100
Ymin = -100
Ymax = 100
Yscl = 100
Xres = 5

I didn't enter those values specifically for this problem, they were already there. So I'm guessing those settings have something to do with the error..

 

[BigGlenntheHeavy]

$\displaystyle f(x ) \ = \ \sqrt{15-x}, \ what \ is \ its \ domain?$

$\displaystyle Hence, \ we \ know \ (or \ should) \ that \ 15-x \ \ge \ 0, \ \implies \ x \ \le \ 15, \ see \ graph.$

[attachment=0:3eb2zk6s]bbb.jpg[/attachment:3eb2zk6s]

 

[mmm4444bot]

My professor found the domain of expressions using the same model.

Okay; I've never seen that feature used on the TI-83. Too bad the professor didn't explain how it works.

Xmin = 100
Xmax = 100

These entries tell the calculator to plot the graph from x = 100 to x = 100. That's impossible.

The xMIN value must be a smaller number than the xMAX value.

By the way, what is the function definition in this exercise? You posted two different definitions. :?

 

[wrongnmbr]

Re:

These entries tell the calculator to plot the graph from x = 100 to x = 100. That's impossible.

The xMIN value must be a smaller number than the xMAX value.

So what would be the correct values to use?

By the way, what is the function definition in this exercise? You posted two different definitions. :?

I did?

Okay, so I'm trying to find the domain for this function: f(x) = ?(15-x)

 

[mmm4444bot]

Okay, so I'm trying to find the domain for this function: f(x) = ?(15-x)

So what would be the correct values to use?

I cannot assist you with instructions on how to find the domain of sqrt(15 - x) using the TI-83. If you do not understand how your professor did it, then please ask your professor to explain it.

If you're simply asking how to plot a graph on that machine, then you decide what portion of the function's graph that you would like to see. Just make sure that your entries for the left and right ends of the graphing window conform to xMIN < xMAX.

By the way, what is the function definition in this exercise? You posted two different definitions. :?

I did?

Do you remember reading something from me about two expressions in red that do not match?

Perhaps, you're basically ignoring my posts.

Proofread your original post. Actually, before posting, please proofread all of your posts, by using the [Preview] button (located next to the [Submit] button).

I previously asked you something like, "Why don't you calculate the domain by hand?"

A person should certainly know how do to that, before learning how to communicate to a machine a request to display it (somehow). Or, perhaps, you don't agree.

:?:

Cheers.

 

[wrongnmbr]

No need to get passive aggressive. There's only one expression [ ?(15-x)]. The second "expression" was obviously a typo on my part.

Also, I didn't ask for help calculating the domain by hand. I asked for help finding the domain using my graphing calculator, as the subject clearly implies. Perhaps you ignored it.

 

[mmm4444bot]

Clearly, I cannot communicate with you.

You will either need to ask your professor to explain the steps to you again or wait here for somebody else to help you. (Of course, there are two very good additional options; I'm confident that you'll eventually figure out what they are.)

Cheers!