# Extra MAT 2023

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Original post by Anonymous
product of roots was 1 (constant term was 2, and coefficient on x^4 term was 2)
lines question was 13 as there were 16 lines in total, so its clear that y = 1 - 10x is gonna 'touch' all 16, but take away 3 from 16 as 3 points are intersections between all three graphs (namely at y = 0, -1/3, -2/3 if i remember correctly)

I can't believe i misread product of roots.That's one of the worst things i've ever done on a test.
(edited 2 weeks ago)
Original post by TheOneRing19
Same I also put 15 ,explain a bit on why you think it was 13 because i think thats probably true now that i started thinking about it more.I also got 9/10 for the sum things.

Each of the lines are of the form y = -x+c (c = numbers 1-7) and y = 2x+k (k numbers 1-9). There are 16 lines and the line -10x +1 crosses each of these once. What the question was essentially asking was where were the intersections of all 3 lines. We can work out that the x coordinates of the points of intersection can be expressed as 9x = c-1 and 12x = k-1. You're therefore looking for the points where (c-1)/9 = (k-1)/12. These are 0/9 = 0/12 (k=1 c=1), 3/9 = 4/12 (c=4 k=5) and 6/9 = 8/12 (k=9 c=7). Thus there are 3 points where all 3 lines intersect. Therefore there are 16 (total intersections) - 3 ("crossovers") =13. That was my reasoning at least.
Does anyone know when they’ll start giving out interviews?
Original post by Anonymous #2
Does anyone know when they’ll start giving out interviews?

I believe from the live chat during the latest Oxford Maths Plus channel, James said that the earliest notification would be on/after the 27th.
Original post by Anonymous #4
I believe from the live chat during the latest Oxford Maths Plus channel, James said that the earliest notification would be on/after the 27th.

I thought he just said it’ll be late November or early December?
Original post by Anonymous #2
I thought he just said it’ll be late November or early December?

I saw a text reply from him (on the slido) to the question stating that. He didnt say that it was guarenteed to be 27th just that it would be the earliest that it might come out.
Original post by Anonymous #4
I saw a text reply from him (on the slido) to the question stating that. He didnt say that it was guarenteed to be 27th just that it would be the earliest that it might come out.

Okay sixk thanks
what does everyone think the average score will be for CS and Phil for interview? I'm guessing around 6 bc they always do significantly worse than CS and Maths courses
Original post by Anonymous #5
what does everyone think the average score will be for CS and Phil for interview? I'm guessing around 6 bc they always do significantly worse than CS and Maths courses

Ye maybe. I feel like the average for all will be fairly similar because there was so few questions. Do you know when we’ll start to hear?