#### Yoshimineb

##### New member

**Pre-U Vector Question: Line has equation r = 9i − j + 8k + λ(3i − j + 2k)**

Hello,

I'm having trouble answering this question.

Q: Relative to the origin O, the point A has position vector given by OA = i + 2j + 4k. The line l has

equation r = 9i − j + 8k + 3i − j + 2k . Find the position vector of the foot of the perpendicular from A to l. Hence find the position

vector of the reflection of A in l.

I found the position vector of the foot of the perpendicular as 3/2[FONT="]i [/FONT]+ 3/2[FONT="]j [/FONT]+ 3[FONT="]k.

But I don't understand how to answer the second part.

I appreciate your help.[/FONT]