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# C4 Vector question! Help please! (june 2015 aqa) Watch

1. Could someone kindly help me out with part c) please?

The only thing from the mark scheme i seem to clearly understand how to get is OD.

I slightly understand how they got OE2, but I'm not exactly sure. Did they use OD as the position vector and then for the direction vector they got that from the line AC? I dunno if i'm making any sense...

Also I added the diagram i drew for part c), is it correct?

Thanks.
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2. (Original post by bakedbeans247)
Could someone kindly help me out with part c) please?

The only thing from the mark scheme i seem to clearly understand how to get is OD.

I slightly understand how they got OE2, but I'm not exactly sure. Did they use OD as the position vector and then for the direction vector they got that from the line AC? I dunno if i'm making any sense...

Also I added the diagram i drew for part c), is it correct?

Thanks.
Well the other position of E will be on the other side of D, but other than that diagram looks good. Yeah, essentially, you add +/- half * the vector AC to OD, and this works because the lines have the same direction.

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