Can someone help me with this vector problem?

Question

If a = i - 2k & b = j + k, find a X b

how would i sketch a, b, & a X b as vectors starting at the origin

Answer 1

a X b is given by:-
i___j___k
1__0__-2
0__1__1

2i - j + k

Difficult (impossible?) to sketch 3 d vectors on this site.