# Math Help - vectors help

1. ## vectors help

for the vectors a=i+4j-2k and b=2i-j+3k find :

axb

2. ## Re: vectors help

Originally Posted by bobmarly12345
for the vectors a=i+4j-2k and b=2i-j+3k find : axb
Evaluate this determinate expanding along the first row:
$\left| {\begin{array}{rrr} i&j&k \\ 1&4&{ - 2} \\ 2&{ - 1}&3 \end{array}} \right|=?$

3. ## Re: vectors help

I assume a x b is the cross product. Try the method described in Wikipedia.