i wasn't @ school the day we learned the cross product.

heres my first question, just help me get this one so i can complete the worksheet please!!!

<-8,13,-2> X <-2,19,1>

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- Mar 21st 2010, 07:23 PMneedmathhelptoujoursthe cross product
i wasn't @ school the day we learned the cross product.

heres my first question, just help me get this one so i can complete the worksheet please!!!

<-8,13,-2> X <-2,19,1> - Mar 21st 2010, 09:25 PMadkinsjr
Do you know how to find determinants? There isn't really anything fancy to understand, the cross product is just a defintion.

If "a" and "b" are the vectors:

The cross-product is the vector defined by:

This is difficult to remember, it's best if you know how to find determinants.

http://en.wikipedia.org/wiki/Cross_product

If you scroll down to "matrix" notation, you'll see how the determinant definition makes 3-by-3 cross products a little easier to remember.