MX1: Suggested Solutions and Discussion

[lakwas7]

What did everyone get for the period question in the SHM? Was it 2pi/root3?

[MahmoudHassan2017]

Nope it was 2pi x root(3)

I reckon 85 e4 cut off... paper was too easy

[Zainbow]

What did everyone get for the period question in the SHM? Was it 2pi/root3?

I got 2 pi root of one third  I may have done something wrong

[lakwas7]

I'd think I was wrong, I was rushing it

[angelahchan]

what did everyone get for the last two multichoice questions?

[mbdtHSC]

what did everyone get for the last two multichoice questions?

Probability one was 2/21 or something I think

[Zainbow]

Probability one was 2/21 or something I think

That's what I put yeah

Was Q9 the binomials one? If so, I think I put C

[Anything]

That's what I put yeah

Was Q9 the binomials one? If so, I think I put C

I also got C for Q9

[jamonwindeyer]

First draft of the solutions is now finished! If anyone notices anything amiss do let me know, I'm heavily multitasking (hence the delay) and this probably caused a slip up or two

[Zainbow]

For 13a, I kept n as root of one third instead of one over root three, and ended up with 2 root one third times pi. Is that still acceptable or would I lose a mark for not simplifying?

[PunjanTriv]

when u differentiate t = 4 - e^(-2x)
isnt it just 2e^(-2x)

[pikachu975]

Value of a should be 1 + root 2

[jamonwindeyer]

when u differentiate t = 4 - e^(-2x)
isnt it just 2e^(-2x)

Ahh good catch, I'll tidy that up! Made it worse for myself

For 13a, I kept n as root of one third instead of one over root three, and ended up with 2 root one third times pi. Is that still acceptable or would I lose a mark for not simplifying?

In that context I reckon you'd still get the 3

[pikachu975]

Also will 97-98 in 4U be alright to state rank 3U?

[jamonwindeyer]

Value of a should be 1 + root 2

Fixed (along with the aforementioned error) in the second draft now visible! I never even stuff up hard things when I'm rushing, it's always stupid stuff like expanding and differentiating, ahaha 

Also will 97-98 in 4U be alright to state rank 3U?

I'd say so, of course that only matters in the event of a tie but if that happened I'd wager 97-98 would be enough