Cross product k(i-2j)

I'm lost how to set up k(1-2j) to get the solution j+2i.

[Rik]

Is your question mathematical or Matlab? What exactly is your question?

[Daniel Lindgren]

I don't know how to set up k(i-2j) in MATLAB.

[Rik]

It is not clear to me what you mean. If you want help, you will have to explain on more detail. Also, in your question you wrote 1, not i.

Answer 1

[the cyclist]

a = [0 0 1];
b = [1 -2 0];
cross(a,b)