NCEA Level 2 Algebra 2017 NZQA Exam - Worked Answers

[@danpireocean4802]

Anyone watching this, you already know you finna cop an Excellence in a minute

[@b1gred710]

How did you do?

[@danpireocean4802]

@@b1gred710 It is what it is, you do things, but you don't let the things do you. BTW, what did you get for that horse question?

[@b1gred710]

@@danpireocean4802 that horse question was the death of me, I couldn't do it i sat there for like 20 minutes and I still couldn't figure it out

[@danpireocean4802]

@@Wappapappa111 OOOOOO, Shoulda seen that, but hope you get an Excellence

[@brendanmurphy7059]

Ex finesse

[@hassanmustaphaa6643]

Indeed the last question is nice and easy excellence! Thank you infinity plus one, goodluck to evryone who is sitting this tommorow👏

[@noahbrown9526]

Not the last minute studies 😂 good luck for tomorrow

[@marklinton9236]

Ninety minutes 😬

[@noahbrown9526]

@@marklinton9236 ninety minutes till I drop out

[@cedriccorpuz240]

Last Minute Review, hope ya'll pass on tomorrows exam :)

[@b1gred710]

How did you do

[@cedriccorpuz240]

Was easy as😂

[@codythefinch9212]

I saw this comment a year later and no joke actually have my math exam tomorrow haha so thanks

[@amorinotoongart4749]

Saw this comment three years later so also thanks haha

[@cedriccorpuz240]

OMGGG, its been 3 years??? ahaha Im on my 2nd year of Enginering degree soon thanks to this❤️

[@dragonsl8r]

I’m taking level 3 calc next year hope these videos help me pass

[@symrankumar318]

Did you pass?

[@hollieharman5897]

Got my exam tomorrow this is so helpful

[@mollymishy]

We all do lol

[@AMandAMboss1111]

Lol

[@b1gred710]

How did you do

[@mollymishy]

@@b1gred710 That Algebra paper though yuuck, but was it just me or were there no finding the eq of tangents on the calc paper?

[@b1gred710]

@@mollymishy if you are talking about the very last question then idk it was very, confusing. The alegbra paper was ok I did ok I think but for some reason I find calc much easier then probability then everyone is like OMG probability is so easy but I guess it just doesn't click for me

[@AshersLambo]

Hey, in question 3C I dont completely understand why the derivative must be less than zero of the question is asking for values of K that make the expression greater than O?

[@b1gred710]

Hey, once the algrebra papers are released from 2018 could you please do worked answers for them for 2 reasons; 1. I would love to see how I could've done it compared to how I tried/didn't do. 2. it may be helpful for next years level 2 algebra students. No rush though but I thought it would be a good idea :)

[@infinityplusone]

I had a look at the papers there were some similar questions in the paper like the ones I did in the tutorials. There will be some facepalm moments as there were a couple of trick word questions. But overall felt the papers were really good.

[@savagester9379]

32:43 sir for this question I worked it out the following way; 3^4(px-3q)=3^5 4(px-3q)=5 4px-12q=5 4px=5+12q P(4x)=5+12q p=(5+12q)/(4x) is this answer still algebraically correct or is there a flaw I'm missing, the answer you got was 17q/4x,

[@MiaStaAna-ey2be]

Algebra exam yesterday was horrible 😭😭 there was this graph that we weren't taught, and OMG THE ATTACK, they did the hard questions at the beginning 😭😭😭😭😭

[@nathanhunt6739]

cramming to the extreme thank you so much

[@vedilovesaloos]

hiii sir, thanks for uploading these videos, but i think there's an error in Q2(d), coz the ans im getting is 934.470. thanksss

[@gul7675]

39:40 why? It says the equation is greater than zero so it should have two real roots not the other way around, I am so confused

[@infinityplusone]

If it is greater than 0 then it has no roots so discriminant is less than 0

[@dominicmcnulty3486]

The question is asking for the values for k when the equation is always than 0, so it will never pass the x-axis, therefore, having no real roots

[@parispovey6420]

anyone that doesn't reckon infinityplusone is the goat, leave

[@infinityplusone]

Far from it :)

[@tobiasmaling276]

YOUR VIDEOS ARE SO HELPFUL

[@infinityplusone]

glad to help!

[@kierachamley6936]

hi there! these videos are lifesaving-- for question 3e how did it go from (-m)^2 to m^2??

[@tyrese-tureicuthill531]

You probably know this already but think of it like this: (-2)^2 is like -2 x -2 which gives rise to a positive number which in this case is 4. The same rule applies for just variables too. (-m)^2 is basically m^2 and since m isn't a number he just left it as m^2.

[@b1gred710]

Good luck everyone

[@savagester9379]

32:43 sir for this question I worked it out the following way; 3^4(px-3q)=3^5 4(px-3q)=5 4px-12q=5 4px=5+12q P(4x)=5+12q p=(5+12q)/(4x) is this answer still algebraically correct or is there a flaw I'm missing, the answer you got was 17q/4x,

[@muffinman9018]

You can't times the numbers inside the brackets by q to get rid of that denominator as ot would change the equation so no I don't think it would be right.

[@savagester9379]

@@muffinman9018 Thanks man, appreciate it.

[@neutronzz3543]

you probably arent even in school anymore but when you get to 4px = 5+12q you can just divide both sides by 4x because 4px/4x is just p

[@HunterGiltrap]

think he may have just saved me

[@infinityplusone]

good luck

[@musicmotions1739]

was very helpful.Thank you.

[@ecodirts1712]

How was the level 2 calculus + algebra exam guys?

[@sheaurlwin8657]

Heckin' Brutal

[@ecodirts1712]

@@sheaurlwin8657 Ikr the algebra paper is harder than the calculus. It's supposed to be the other way around

[@sheaurlwin8657]

@@ecodirts1712 There were some pretty whacky questions that I'm sure I'll face-palm to when he gets round to doing them lol...

[@ecodirts1712]

@@sheaurlwin8657 Well, I think you will get a good result. The minimum to get an excellence in a paper is to get 2 Excellence, 1 merit and 1 achieved question correct

[@sheaurlwin8657]

@@ecodirts1712 What the fuck...how is this graded lmao...That's reassuring xD

[@yepcool4940]

32:58 Why Do you automatically assume it is 3 to the power of something, it could be any other number to the power of.

[@infinityplusone]

This is because after a while you recognise patterns with the numbers. For example 32, 256 are all 2 to the power of something.

[@alexlynch6383]

Much appreciated man :)

[@gvtlynx7435]

Hey infinity, Q3 (b) states that you need to find two equal roots, so wouldn't it be b^2 - 4ac > 0, not equal to 0, since we are trying to find 2 roots?

[@neutronzz3543]

i know its a bit late but the question asks for what values of m will make the equation have 2 equal roots which is the same root so its just one root like (x-3)^2 so pretty much the discriminant is 0 when there is only one unique root.

[@fno2009]

damn just in time thank you!

[@rybina1315]

agreed

[@b1gred710]

How did you do

[@Alexischile10nz]

Hi Infinity + 1, I recall from one of your other videos that factorising questions like 3D) could often leave out one of the two answers, however, like in this case, it is easier to factorise. So, have you got any tips to differentiate between the two, or is it just luck? Thanks in advance!

[@zaddydynamite]

39:32 I dont get that? If the discriminant is less then 0 it means no real roots right? but it says the expression has to be greater then 0 so why is b2-4ac less then 0?

[@many8822]

I don't know if this is right... but I'm pretty sure that because the EXPRESSION is always greater than zero it means that the parabola will not touch the x-axis because if it does then it is not greater than zero anymore. This therefore means that the discrimant has to be less than zero in order for the parabola to not touch the x-axis.

[@MegaR12301]

You are the best

[@b1gred710]

How did you do

[@ngoanhkha4015]

appreciate you my bro

[@thamarualagiyawanna6918]

Hi Sir, Do you do tutoring?

[@infinityplusone]

I used to but not anymore man, too much time consuming and feeling guilty about charging people for something I enjoy doing for free :)

[@phillipl2718]

@@infinityplusone What a guy!

[@CanadianBaconE]

I love you for this

[@shavegenova5292]

Why raise (0.3192)^1/2.45 on 30:18

[@infinityplusone]

It's a trick that we use, will go over it next time I run LIVE tutorials

[@williampaterson115]

Thanks, so much this is so helpful!

[@yepcool4940]

At 29:00 How do you know what the letters mean? Eg: How do you know 'A' is the initial value? 'y' is the value it depreciated?

[@infinityplusone]

With the A(r)^t formula, A is always the initial value. There are other forms of this formula.

[@yepcool4940]

@@infinityplusone Thanks man, I appreciate it.

[@rishinavaneethan6436]

The voice of god

[@infinityplusone]

Where, I really need to ask him a question.

[@colinxu2198]

Why is it in 1d you write x+3 I assume it would be x-3 and 3 less people are going

[@arropy4132]

Can you please make a calculus one?

[@matthewking5362]

Couldn't you simplify the question at [4:03] sooner by cube rooting the entire equation? 64/x^3 = 4/x ?

[@infinityplusone]

No you can't if x = 2 then you would get 64/2^3 = 8 but 4/2 = 2. So you can't do that. You can only do that if it is an equation not for expressions.

[@coherentlamp2687]

Thank you

[@infinityplusone]

You're welcome

[@morgan6255]

Thank you!!

[@kingharry3385]

Should you simplify 1b more to 2x+10/9x+6 ?? and same with 3d is it bad to simplify to 3/2x-6

[@infinityplusone]

time stamp please

[@kingharry3385]

@@infinityplusone 4:36 and 43:46 also sorry for replying to an older question thats gotta get annoying.

[@ecodirts1712]

Omg thx so much for uploading this

[@875_Iuvr]

life saver thank you

[@oscarcrowe6965]

you deserve and award

[@infinityplusone]

Got one this year :) www.newshub.co.nz/home/new-zealand/2019/02/one-of-the-country-s-best-teachers.html

[@bekahem-jae1081]

@@infinityplusone :O I was trying to figure out your accent for so long haha

[@gul7675]

Why did you uses plus or minus for the last question

[@renees1922]

It's a root, always use it if you are rooting something and you'll get marked higher.

[@air7301]

Thank you!

[@MiaStaAna-ey2be]

13:11 why did the 4n became positive when it was a negative?

[@nayu1571]

because of the minus outside the bracket. so when u times it, it becomes positive. - x -4n= +4n

[@MiaStaAna-ey2be]

@@nayu1571 thank youuuu💜

[@aleenarobin39]

THANK YOU QUEEENN

[@arrr-li1jf]

THANK YOU SO MUCH

[@infinityplusone]

happy to help!

[@fredfreddredick4811]

please do a video on lvl 1 TEG 2018 sir

[@infinityplusone]

Ah man been a bit busy with a few things but I will sort it out soon hopefully a lot earlier this year.

[@tonyphan6279]

2017 level 1 geometric reasoning?

[@caenir]

I remember doing that last year. It was absolute bullshit. Got an achieved in that, but gained excellence in math overall. Hopefully for you they simplified it a lot.

[@tonyphan6279]

@@caenir yeah i heard they made the paper beyond the the level 1 criteria, hope they dont make it wack for us this yr :/

[@infinityplusone]

Sometime this week hopefully!

[@pme-ox1ye]

@@caenir I remember doing that last year as well, it made me want to shout the word EVIL really loudly in the middle of the exam, but still passed it with a merit.

[@bekahem-jae1081]

I thought if greater than 0 its +ve so two real roots? Q 3) (c)

[@sarablack5341]

also late but the roots of an equation occur when the equation = 0 so if the equation never equals zero, it won’t have any roots. If the discriminant (b^2-4ac) is positive then it has real roots but if the equation itself (ax^2+bx+c) is always positive, it will never equal zero and so there will be no roots. Hope that made sense

[@brookekingsbury8941]

can you do 2e with logs instead? it ends up being p= 1.25q + 3 divided by x

[@dachosen1625]

i got 4.25q divided by x but i used logs too im not sure why we can’t use logs

[@ExplosiveGeek]

for anyone else that uses logs and comes here, yes you can use logs and the answer is 4.25q/x this answer is still worth the E point. (This is because 17q/4x is the same as 4.25q/x)

[@Ibrahim-tq8hv]

NCEA level 1 math livestream?

[@locostacos6331]

Kermxd Dude I think us level 2 students need a math livestream more urgently than you guys 😂

[@rybina1315]

next year could you please post this earlier than 12 hours before the exam

[@fno2009]

This was posted 19 hours before the exam lol

[@b1gred710]

Don't be a fucking ass hole, he doesn't have to make these he makes these because he wants to help although being posted a day before the exam I am very very grateful for it being posted at all and you should be too

[@caenir]

It's useful as hell for just checking up on what you know. At least it wasn't in the morning.

[@shahilax4118]

At 6.50 what happened to the x on 15?

[@infinityplusone]

factorised :)