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    Reference: Edexcel C4 book Mixed Ex5K, Q2.I found the vector AB to be (-6, -3, -3) and have found the vector AP by multiplying AB by 2/3, since AP=2BP and found that AP= (-4, -2, -2). I then used AP = *p* - *a* and called P's coordinates (x, y, z) to find (x, y, z) - (5, 4, 1) = (-4, -2, -2) and found that (x, y, z) = (1, 2, -1). This is wrong but I'm not sure why, can anyone explain? I think I may have worked out AP wrong.

    could you post the question please ? maybe scan it or something...
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Updated: October 24, 2016
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