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# FP3 Maths OCR Question (Vectors) watch

1. On the June 2010 FP3 OCR Past paper, On question 7 part iii it states to use k as being 4, but allows k as being 4 root 21, which is what I used. The final part uses k = 4, and was wandering if anybody could explain why? Thank you.
2. (Original post by sarahemilyglass)
On the June 2010 FP3 OCR Past paper, On question 7 part iii it states to use k as being 4, but allows k as being 4 root 21, which is what I used. The final part uses k = 4, and was wandering if anybody could explain why? Thank you.
The perpendicular to the plane through (-7, -3, 0) meets the plane at

So you need to double that, not double the distance.
3. (Original post by Zacken)
The perpendicular to the plane through (-7, -3, 0) meets the plane at

So you need to double that, not double the distance.
Ahh I understand thank you! Spent all day learning/revising vectors so think I reached my limit for the day haha
4. (Original post by sarahemilyglass)
Ahh I understand thank you! Spent all day learning/revising vectors so think I reached my limit for the day haha
Awesome! No problem, hope it was a productive day.

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