its given

a(vector) = {2; -3; 6}

b(vector) = {-1; 2;-2}

There is an orange line which halfs the angle between two vectors {shown in picture}

Now problem says:

Find a vector over orange line {showed in the picture} that length is $\displaystyle 2 \sqrt(42)$

note! The problem doesnt say that vectors starts from {0,0,0} point, I just draw the figure to illustrate it more better. The problem doesn't contain any picture with it.

The answer = {-2,10,8}

The 2nd answer = {2,-10,-8}

please explain for me, how to solve it! step by step. Thanks in advance

Thank you in advance