# Mat 2023

Scroll to see replies

Original post by Anonymous
how many solutions to that long equation with like 4 roots in it. and the answer was like 6/7 or something

oh yeah, have no clue what that question was but think i put 7
Original post by Anonymous
oh yeah, have no clue what that question was but think i put 7

yeah i think they tried to catch ppl out cus some of the square roots had a negative in them so u had to remove them as solutions.
ok jesus last two qs were isosceles triangle + the binomial expansion one. thank **** my brain **** that out randomly

8/10 im thinking cuz i ****ed up the integral one and triangle one (somehow), but it is what it is
Original post by Anonymous
ok jesus last two qs were isosceles triangle + the binomial expansion one. thank **** my brain **** that out randomly

8/10 im thinking cuz i ****ed up the integral one and triangle one (somehow), but it is what it is

i think for triangle i got second last one iirc, which would be D. i just did Pythagoras and 1/2bh for all of them, and that one was highest if I didn't make silly mistake. for binomial it was just difference of two squares and was like -2 to the 11 or something. did you get same?
Original post by Anonymous
i think for triangle i got second last one iirc, which would be D. i just did Pythagoras and 1/2bh for all of them, and that one was highest if I didn't make silly mistake. for binomial it was just difference of two squares and was like -2 to the 11 or something. did you get same?

For the triangle one, you just used derivatives to optimize for the area. Apparently the maximum was base at sqrt(200) and base of 15 was the closest one to that
Original post by cardtricks
For the triangle one, you just used derivatives to optimize for the area. Apparently the maximum was base at sqrt(200) and base of 15 was the closest one to that

ohh thats sm smarter than what i did. same answer though so its alright,.
On Q4, were there any nice ways of doing the first two parts other than lots of algebra and rearranging?
Original post by soljwilliams
On Q4, were there any nice ways of doing the first two parts other than lots of algebra and rearranging?

i personally just did algebra but subbed a big rooted fraction with a variable and that made it easier then converted back at end.
Original post by Anonymous
i think for triangle i got second last one iirc, which would be D. i just did Pythagoras and 1/2bh for all of them, and that one was highest if I didn't make silly mistake. for binomial it was just difference of two squares and was like -2 to the 11 or something. did you get same?

binomial one was just -(5C3(2^12)) IIRC, so -(5 x 2 x 2^12) which was -2^13 x 5? Thats what i got atleast, assuming i didnt accidentally miss a term/trick.
Original post by Anonymous
binomial one was just -(5C3(2^12)) IIRC, so -(5 x 2 x 2^12) which was -2^13 x 5? Thats what i got atleast, assuming i didnt accidentally miss a term/trick.

What did you get for question A (closest log to an integer)
Original post by Anonymous
What did you get for question A (closest log to an integer)

C i think? which was equiv to log98

hint kinda gave the trick away fortunately
used the hint tofind out log something + log sometihing = 2 - log (9.8) and log(9.8) is pretty much an intger
Original post by Anonymous
Did anyone else get 4 to the power of 8 for the last part of q3? For the max value of the cos function

Yes I did. Also what did u guys get for the mcqs where an expression was squared like 3 times, and u needed to find the number of real roots?
Original post by kgeorge_c17
Yes I did. Also what did u guys get for the mcqs where an expression was squared like 3 times, and u needed to find the number of real roots?

I want to say 7 roots but do not quote me, it 6 or 7
Original post by dsfdf
used the hint tofind out log something + log sometihing = 2 - log (9.8) and log(9.8) is pretty much an intger

Wait which form did that answer take? Like in terms of alpha, beta, gamma
Original post by dsfdf
I want to say 7 roots but do not quote me, it 6 or 7

Kl thanks. Also for M I got 4/3 but other people getting 3/2. What's the agreed result?
Original post by kgeorge_c17
Kl thanks. Also for M I got 4/3 but other people getting 3/2. What's the agreed result?

its 3/2 you can check on desmos
Original post by kgeorge_c17
Kl thanks. Also for M I got 4/3 but other people getting 3/2. What's the agreed result?

i got 3/2 too but i got the answer p quickly making me think it might've not been the right way. but I've seen too many people getting 3/2 so its probably that.
Original post by mcnuggetmeal
Wait which form did that answer take? Like in terms of alpha, beta, gamma

2 alpha + beta I think. Or smth similar
Original post by kgeorge_c17
2 alpha + beta I think. Or smth similar

for integral q j what did you get?