Question

How to put a cross product in TI 89?
MEDAL

Answer 1

Google is your friend. I typed "ti 89 cross product" into google and found this as the first result.

https://epsstore.ti.com/OA_HTML/csksxvm.jsp?nSetId=76557

Answer 2

I have googled it for the last two hours. Nothing works.

Answer 3

How do you input matrices?

Answer 4

So far I know to go to
Catalog -> crossP
but from there I keep getting "too few" or "too many arguments"

crossP([i, j, k;1, 2, 3;1, 2, 3])
nor
crossP([i, j, k][1, 2, 3][1, 2, 3])
nor
crossP([i, j, k],[1, 2, 3],[1, 2, 3])

What else is there to try?

Answer 5

No, you do not need the [i,j,k] part. You only need the [i,j,k] part when you are evaluating it as a determinant. crossP([1, 2, 3],[1, 2, 3]) should find the cross product between [1,2,3] and itself and should be 0.

crossP([1, 2, 3],[4, 5, 6]) should find the cross product of [1,2,3] and [4,5,6].

Answer 6

Got it, thanks.