1. The problem statement, all variables and given/known data Still having a little trouble so here's the problem. (ex + ez) x (3ey - 4ez) 3. The attempt at a solution (ex * ez) + (ex * (-4ez)) + (ez * 3ey) + ( ez * (-4ez) now, these are all orthogonal to each other, so, for example, if I have ex * ey then I should end up with ez, shouldn't I? So here is my solution. = 3ez - 4ey + 3ex - 4ez = 3ex - 4 ey + ez The solution shown to be correct is -3ex + 4ey + 3ez so what have I done wrong, please?