How to Solve Dot Product Homework Using Vector v?

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seto6
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Homework Statement


2v1m3ax.png

Homework Equations



know dot product

The Attempt at a Solution


PART A
2cr2ij6.png


PART B
not sure what's it asking for

help would be great
 
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I think both can be solved if you dot product both sides with the vector v.