- #1
thomas49th
- 655
- 0
Homework Statement
Find a vector perpendicular to these vectors
a = i + 2j + 7k
b = i + j - 2k
Homework Equations
a.b = |a||b|Cos(x)
a x b = |a||b|Sin(x)
The Attempt at a Solution
So a.b = 0
a x b = |a||b|
|a| = sqrt(54)
|b| = sqrt(6)
a x b = sqrt(324)
Have I acutally got anywhere?
Thanks
Tom