Composing Functions on TI-83

N

noitsalluptome

New member
Joined
Mar 11, 2009
Messages
5
Hi! I'd like to know how to set up the following on a graphing calculator:

f(x)=3x+2; g(x)=x-1

If I use Y[sub1]=3x+2 and Y[sub2]=x-1, how can I use Y[sub3] to find f(g(x)) and g(f(x))?

My text shows: Y[sub3]=Y[sub1](Y[sub2](x)), but I don't know how to put the Ys in the Y= window.

Thank you,

Brian
 
I do not have a TI-83 handy to check, but I seem to remember that the Y variables are accessed by first pressing the VAR key (VARS, maybe?), followed by selecting the appropriate menu.

If you still cannot figure it out, then let me know, and I will go to ti.com and download the user guide and look it up for you.

By the way, the Free Math Help site has a board specifically for asking calculator questions. Next time, please post your calculator questions there.
 
Why on earth are they requiring you to attempt to compose the functions like this?!? :shock:

It's so much simpler to just do the algebra and then plug that into your calculator! :wink:

The "VARS" key should be right by the down-arrow key. Enter f(x) and g(x) in Y1 and Y2. Then f(g(x)) would be Y3=3Y1+2 and g(f(x)) would be Y4=Y2-1.
 
You must log in or register to reply here.
Top