The answer given is 0, and the book is trying to show that the two vectors are orthogonal. However, to find the cross product of these vectors, I've taken the CROSS PRODUCT by first putting it into matrix form and then solving, and each time have ended up with -93x + 138y + 18z, or <-93, 138, 18>. And that doesn't add up to zero. What, if anything, am I doing wrong?
2006-07-14 11:16:50 · 3 answers · asked by inhisgrip4eva 1 in Science & Mathematics ➔ Mathematics
After you cross them you have to dot them.
2(-93) + 2(138) + (-5)(18) = 0
2006-07-14 11:19:42 · answer #1 · answered by MsMath 7 · 4⤊ 0⤋
it has to do with directional derivatives. set the gradient equal to zero and solve...that oughta get you started.
2006-07-14 21:01:16 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Ow..ow...OW!!!
STOP!
You're making my head hurt!
I never was good at math...and this is even hurting my eyes!
2006-07-14 18:18:26 · answer #3 · answered by docscholl 6 · 0⤊ 0⤋