What does this dot product problem want?

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seto6
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Homework Statement


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Homework Equations



know dot product

The Attempt at a Solution


PART A
Handwritten working in red ink: U dot V equals W dot V, with W = [1, 2, 3], V = [2, 4, 6], U = [x, 2, 4], and the line 2x + 8 + 24 = 2 + 8 + 18 leading to x = -2, beside typed notes about U not having to equal W.


PART B
not sure what's it asking for

help would be great
 
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