Here's the problem: "Given that v = 2i + 3j - k and w = i - j + 2k, find (v x w) x w."

For some reason, I can't seem to get the right answer for this question.

v x w = [2, 3, -1] x [1, -1, 2] = (6-1)i + (4-(-1))j + (-2-3)k = 5i + 5j -5k

Then, (v x w) x w = [5, 5, -5] x [1, -1, 2] = (10-5)i + (10-(-5))j + (-5-5)k = 5i + 15j - 10k.

Could someone tell me where I went wrong?