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# TeeEm's practice paper vector help

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1. When doing one of the papers (paper u) from his website I came across this vector question.

Now I don't really follow the last step where he equated (-2,2,-4) to the original question's (2,-2,4). Is there an identity of something I'm missing?

Attachment 548833548835
Attached Images

2. (Original post by bananamonkeys)
When doing one of the papers (paper u) from his website I came across this vector question.

Now I don't really follow the last step where he equated (-2,2,-4) to the original question's (2,-2,4). Is there an identity of something I'm missing?

Attachment 548833548835
Looks like he made a minor slip.

Should have beeen in prior working to flip the direction vector around.

So, eventually,

TeeEm FYI.
3. (Original post by ghostwalker)
Looks like he made a minor slip.

Should have beeen in prior working to flip the direction vector around.

So, eventually,

TeeEm FYI.

Great! thanks a lot

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