0 a
M
B
C
4a
O is the origin, OA=a, OC = c and CB = 4a.
M is the midpoint of AB.
(a) Find, in terms of a and e, in their simplest form
(i) the vector AB,
Answer(a) (i) AB =
(ii) the position vector of M.
Answer(a)(ii)
(b) Mark the point D on the diagram where OD = 3a + c.​

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