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C4 Vectors help please

The last part is where I need help please. I thought the ps would cancel, so I could easily determine lambda. Then work out x, y and z to get the position vector of N and job done, but that flopped despite my effort in doing that huge expansion :frown:

Thanks a lot. :smile:

Reply 1

the bear

well you need to set the dot product to zero...

so 22p - 44 must be zero...

Reply 2

krisshP

Original post by the bear

well you need to set the dot product to zero...

so 22p - 44 must be zero...

Oh yeah, I thought P was a foxed point. I understand it now.

Thanks

Reply 3

Ilovemaths96

Point p lies on line l.
Therefore vector mp is perpendicular to line l.
Set the scalar product of the these vectors equal to zero and you should get your answer