Vector Problem

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• August 28th 2008, 10:51 AM
Dubulus
Vector Problem
Given the vectors a=<8,6,8> and b=<1,2,-1>, express a as a sum of a vector parallel to b and a vector perpendicular to b.

Thanks!
• August 28th 2008, 10:58 AM
Plato
$a = \frac{{a \cdot b}}{{b \cdot b}}b + \left[ {a - \frac{{a \cdot b}}{{b \cdot b}}b} \right]$