If vectors and , what is the cross product ?
Answer and explanation
Correct answer: A.
- Step 1: Compute determinant of matrix .
- Step 2: -component: .
- Step 3: -component: .
- Step 4: -component: .
Answer
<-10, 7, 9>.
Why not the others: Signs differ if alternating signs of cofactor expansion are applied incorrectly.
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