Question about the ti-89, can't find a special type of square root =P

[etalns]

Hey all, been looking for the cubed square root for the last few days on my ti-89

On a ti-83 you'd just go under math --> then you can find itthere

it is like a normal square root sign, except it has an exponent 3 before it. You use it to root cubes etc.

Would appreciate it a ton if anyone can help me out.

 

[Chaotic42]

My Ti-86 has an "X-root" function. It's a square root symbol with an x in the corner. You'd hit

3
(x root thing)
8
Enter

and get 2.

Maybe the 89 has something similar?

 

[Mister T]

raise the number to the power of (1/3)..... same thing

 

[Keego]

Originally posted by: Mister T
raise the number to the power of (1/3)..... same thing

that's what I do w/ my 89

 

[Rahminator]

The cubed square root is under the any key.

 

[etalns]

Originally posted by: Rahminator
The cubed square root is under the any key.

In my complete and utter stupor of being up for over 36 hours now....I actually looked for the any key for about 20-30 seconds...then it hit me.

grr!

 

[etalns]

I've looked, and it says there is an x/root function somewhere in the calculator. Now to find it.

This is worse than Where's Waldo =(

 

[Rahminator]

Originally posted by: Qosis

Originally posted by: Rahminator
The cubed square root is under the any key.

In my complete and utter stupor of being up for over 36 hours now....I actually looked for the any key for about 20-30 seconds...then it hit me.

grr!

When it hit you, did it also make you realize that there's no such thing as a cubed square root?

 

[etalns]

Wait, its cubed root

 

[Rahminator]

Originally posted by: Qosis
Wait, its cubed root

Now you're getting somewhere. Crack open the TI-89's documentation and look under index for cube root.

 

[Yomicron]

As far as I know, the TI89 doesn not have that function built in.

You have to do x^(1/3)

but if you want a xroot command do this:

Goto APPS -> Program Editor -> New...
Set type to Function
Name it xrt (you can name it anything, but its best to make it short)
where it says xrt() make it say xrt(b,r)
under FUNC type b^(1/r)
press HOME

Usage example:
cubed root of 8

type xrt(8,3) and you should get 2 as the answer

 

[etalns]

woot, got it =)

 

[Yomicron]

Currently here is what my program looks like

xrt(b,r)
Prgm
b^(1/r)
EndPrgm

Now, where did I go wrong on that one? I dont see anywhere that it says function to put the second section under, or do I input that myself.

when you are at the new program dialog box, select Function from the type menu. ( the default is Program )

 

[Keego]

making a program for putting a 1/ is way too much work.