For and , find .
Answer and explanation
Correct answer: C. -29
- Step 1: .
- Step 2: .
Answer
-29.
Why not the others: 27: the cross terms are used. 1: the components are added. -11: the second product is subtracted.
Practise more Vectors.
Free questions with an explanation for every one, and full timed Leaving Cert Ireland mock tests.