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## Homework Statement

What is the magnitude of the sum of the following vectors?

A= i +5j -k

B= 4i-j-5k

C= -i+j

## Homework Equations

## The Attempt at a Solution

What I did was I added i+4i-i to get 5i, I also added 5k+j-5 to get 5j, likewise for k to get -6k

and did the squareroot of (25+25+36) to get squareroot of 86 or 9.27 however that is not the right answer. What am I doing wrong?

Thank you