IGCSE Mathematics January 2022 - 4MA1/2HR

IGCSE Mathematics January 2022 - 4MA1/2HR

Contents:
00:00 - Intro
00:10 - Question 1
00:54 - Question 2
04:14 - Question 3
04:52 - Question 4
07:21 - Question 5
08:22 - Question 6
09:34 - Question 7
11:59 - Question 8
14:09 - Question 9
16:13 - Question 10
17:26 - Question 11
18:08 - Question 12
19:27 - Question 13
21:29 - Question 14
26:32 - Question 15
27:32 - Question 16
31:46 - Question 17
33:11 - Question 18
35:26 - Question 19
36:59 - Question 20
39:55 - Question 21
42:53 - Question 22
47:36 - Question 23

[vyshnavipadmaja]

Hey man, I want to share my utmost gratitude for your videos on the IGCSE & GCSE past papers. They were an absolute lifesaver. Math is my weakest subject, but you really helped me understand all the concepts in order to approach the paper well. I managed to get a 9 in maths and it is solely thanks to you. Congratulations on reaching 1k subscribers! You deserve it for all the hardwork you put into your videos.

[thomassf]

Thank you for the help with question 22 - the MS alone wasn't enough to help, so thank you for this 🙏🙏

[LuckyGe]

Hi! Thank you sm for your videos! Your explanations are so simple and easy to follow I love them sm!
If you don’t mind, I would like some advice..
How do I train myself to spot what needs to be done in each question? Like knowing what things to do after I read a question
Honestly, right now, I’m about 5 months away from my GCSEs but I still can’t answer these questions confidently. I’m doing a lot of past papers but since each paper is different how exactly do I study all of this? (I’m aiming for a 9 btw) Thanks so much for these videos!

[ZZi]

Love your videos, they always help me so much. Thank you!

[hay-zjqk]

Hi there for question 22 I understand the method that you used but what i dont understand is why is it wrong to do this : First, I said the gradient of AB must be 7/6 because its perpendicular to AC, then i did 7/6 = (10--5/p--1) so 7/6 = 15/p+1 then i cross multiplied and isolated, p but i get a decimal value which is wrong. Thank you so much for the videos as well.

[ElfyeRichards]

Sorry to bother - I was just wondering for question 22 (and all questions where you are using two coordinates and you need to know y1 and y2 to find either the gradient or the distance between two coordinates), how you know which y value is y1 and which is y2?

[TheNoobHamster]

38:16 I do not understand how you got y= k/T^3 what happened to the square root of K and how did you get rid of it?

[ryu]

What was the reason for solving simultaneously? Because of two perpendicular lines? Or because 3 gradients?

[ghost_killer]

In question 22 how did we know that by multiplying the two gradients we get -1?

[scarletmouse]

pls can you explain again why you chose the - sign instead of + at 49:57

[scarletmouse]

hi i have a question 👆at 38:17 how did you know to put the new constant k on top of the fraction instead of in the denominator or beside it?

[mimi-bjni]

hi, for question 21 can i use the formula 3πr^2 for the surface area of the hemisphere instead?
and for question 22 why cant i just take the reciprocal and switch the sign of 15/p+1 to find the perpendicular side BC

[HarpSeal]

Hi, for question 4 5:38, how did you know that angle BIC = BCI?