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## Homework Statement

Consider the two vectors L= i +2j+3K

K=4i+5j+6k

Find scalar 'a' such that:

L - aK is perpndicular to L.

## Homework Equations

if two vectors are perpenicular dot product=0

## The Attempt at a Solution

(i+2j+3k).{(1-4a)i+(2-5a)j+(3-6a)k}=0

I get three values of a here. but none satisfies th whole equations at the same time. Please help me