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# Fp1 watch

1. why is the x coordinate not 12 for p the diagram shows its 12
3F question 3c
https://644625398389466aee0063322305...0NRNU0/CH3.pdf
2. ..
3. (Original post by Acrux)
why is the x coordinate not 12 for p the diagram shows its 12
3F question 3c
https://644625398389466aee0063322305...0NRNU0/CH3.pdf
First diagram on page 68 is incorrect. The 16 and 12 should be the other way around.

Algebra is correct. Distance to focus = 28, which is also the distance to the directrix. Since directrix is at x=-12, x-coordinates must be 28-12 = 16.
4. (Original post by ghostwalker)
First diagram on page 68 is incorrect. The 16 and 12 should be the other way around.

Algebra is correct. Distance to focus = 28, which is also the distance to the directrix. Since directrix is at x=-12, x-coordinates must be 28-12 = 16.
Ok
Thanks
5. Could you help me with this question how do they find the t values from 0=-a+at^2
they say -a is 1
3F question 5b
https://644625398389466aee0063322305...0NRNU0/CH3.pdf
6. (Original post by Acrux)
Could you help me with this question (Zacken
how do they find the t values from 0=-a+at^2
they say -a is 1
3F question 5b
https://644625398389466aee0063322305...0NRNU0/CH3.pdf
They don't say -a is 1, they divide through by a. If then as shown in the MS.
7. (Original post by Kvothe the arcane)
They don't say -a is 1, they divide through by a. If then as shown in the MS.
ok i get it thanks

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