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# Vectors maths question help!!!

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Why bother with a post grad course - waste of time? 17-10-2016

1. How do you do this???
I teied but i dont even know where to start!

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2. Bump

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3. (Original post by bluepearl7)

How do you do this???
I teied but i dont even know where to start!

Posted from TSR Mobile
First I would use the idea of MNC being a straight line, they told you that for a reason.
Try that first but I'll leave my working out but resist the temptation to look unless you still absolutely can not do it.
Spoiler:
Show
AB = AO + OB
=-6a + 6b
AC= -12a +12b
MC = MA + AC
MC = 3a - 12a +12b
-9a + 12b
MC= 3(-3a + 4b)
Since MN and NC are part of the same line as it is straight, MC should be a multiple of MN.
MN = MO + ON
MO = -3a and in order for MN to be a multiple of MC, ON has to be 4b so k=4
4. I tried but vectors really isn't my strong point.

Thankyouu soooo much!
I really appreciate it!

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