Linear Algebra Question

5060Jon

New member
Joined
Jan 27, 2021
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4
Hi,
I worked out this question with vectors but i am not confident in my answers, For the first question I got 98 and for the second i got 23. I have attached the question and my workings. If someone can verify it would be appreciated. Thanks

Screen Shot 2021-01-27 at 10.42.56 PM.pngScreen Shot 2021-01-27 at 10.47.04 PM.png
 
To 5060Jon, your notation is sloppy in the extreme; I would not give you any credit for it.
Moreover, why did you answer the replies to your other post?
You should now that \(\|\vec{v}\|^2=\vec{v}\cdot\vec{v}\).
\((\vec{u}-\vec{v})\cdot(2\vec{u}-3\vec{v})=2\vec{u}\cdot\vec{u}-3\vec{u}\cdot\vec{v}-2\vec{u}\cdot\vec{v}+3\vec{v}\cdot\vec{v}\)
Can you post more answers?
 
Thank you for the comment on the quality of my notation. my writing (though apparently extremely sloppy), looks the same as what you have written, does this mean that I am doing it correctly. To me, this is a new concept and I am just trying to learn. maybe you could show me the correct notation
 
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