What is the magnitude of the sum of the following vectors?
A= i +5j -k
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?