# Math Help - Vector Problem

1. ## 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!

2. $a = \frac{{a \cdot b}}{{b \cdot b}}b + \left[ {a - \frac{{a \cdot b}}{{b \cdot b}}b} \right]$