So, the cross product of w x w will be <0, 0, 0>.
Now, let's consider the cross product (3u x w). We can factor out the scalar 3 from this expression, so it becomes 3(u x w). We are given that u x w = <7, -5, -3>. So, 3(u x w) = 3<7, -5, -3> = <21, -15, -9>.
Show more…