Parallel Vectors - Learn How to Calculate

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Sorry - Answered my own question.
 
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To find a vector which is perpendicular to 2 others, just find the cross product between the two.

Let A(1,-1,2) and B(2,1,-3).

A x B will be perpendicular to both vectors A and B.
(I hope you know to find cross product)

To find unit vector just divide the resultant with the norm.
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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