B The diagram shows points A and B, which have position vectors a and b with respect to an origin O. Pis the point on OB such that OP: PB= 3:1 and Q is the midpoint of AB. (a) Find PO in terms of a and b. |2] The line OA is extended to a point R, so that PQR is a straight line. (b) Explain why PŘ = k (2a – b), where k is a constant. |2]

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Can you help me with part b
b.
The diagram shows points A and B, which have position vectors a and b with respect to an origin O.
P is the point on OB such that OP: PB = 3:1 and Q is the midpoint of AB.
(a) Find PO in terms of a and b.
|2]
The line OA is extended to a point R, so that PQR is a straight line.
(b) Explain why PR = k (2a – b), where k is a constant.
|2]
Transcribed Image Text:b. The diagram shows points A and B, which have position vectors a and b with respect to an origin O. P is the point on OB such that OP: PB = 3:1 and Q is the midpoint of AB. (a) Find PO in terms of a and b. |2] The line OA is extended to a point R, so that PQR is a straight line. (b) Explain why PR = k (2a – b), where k is a constant. |2]
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