AQA A Level Mathematics Paper 1 (7357/1) - 6th June 2023 [Exam Chat]

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Can anyone explain question 10a on the Primrose Kitten paper?

Screenshot 2023-06-05 202537.png

I know you ln both sides and then differentiate, but I don't understand how they got dy/dx 1/y
I thought the derivative of ln y is 1/y, so where did the dy/dx come from

Screenshot 2023-06-05 202623.png24.1KB

Reply 41

croonky

Original post by DS13990609

Can anyone explain question 10a on the Primrose Kitten paper?

Screenshot 2023-06-05 202537.png

I know you ln both sides and then differentiate, but I don't understand how they got dy/dx 1/y
I thought the derivative of ln y is 1/y, so where did the dy/dx come from

Implicit differentiation with respect to x. So after differentiating a y value you need to put a dy/dx on the end.

Reply 42

idk222222222

Original post by croonky

Unless half of the document is missing you put your answer as 4-8(ln6+ln4)? but that's the same as 4-8ln(6*4) => 4-8ln24 = -21.42443064

It's just the factorised version i'm referring to, before u factorised, the answer was correct

i meant take away instead of adding and put it in the calculator as take away

Reply 43

DS13990609

Original post by croonky

Implicit differentiation with respect to x. So after differentiating a y value you need to put a dy/dx on the end.

Ohh. Thanks, btw what % did u get from this paper

Reply 44

tonkzs-

Original post by idk222222222

this what i got and checked it with my graphical calculator
https://docs.google.com/document/d/1iVh4ows45jq36RtOi7fVoOQEUSsQCegFWhPng2jhHRw/edit?usp=sharing

Can you please explain as to what you did on the actual integration step?

Reply 45

Azarel

Original post by DS13990609

I'm gonna be honest. Out of all 3, pure is is the easiest paper and mechanics is hell. I think I can get an A* in paper 1. I've made a list of key topics that came up in previous papers (2018-2022) and made predictions on what's to come in paper 1. If you want, I can send you a link to the document

Hey can you send it to me too please?

Reply 46

idk222222222

Original post by tonkzs-

Can you please explain as to what you did on the actual integration step?

There is a rule where integral of (1/ax+b)= 1/a(ln|ax+b|)+c

Reply 47

_OSHii

How are we feeling everyone
I’m absolutely bricking it but it is what it is

Reply 48

Ronan_verulam

Original post by _OSHii

How are we feeling everyone
I’m absolutely bricking it but it is what it is

Feel you man, I'm nervous but just wanna do it

Reply 49

blobblobberton

honestly lads this is my first exam. I'm aiming for an A and got an A on most of the papers I've done Alhamdulillah lol, so I'm feeling okay - just dreading it slightly as it is my first and i feel like thisll either make or break me. good luck to the rest of u, ln gang ln gang

Reply 50

Pwca

TSR Community Staff

Hey everyone :smile:

How did you all find the exam?

A-level Mathematics

Reply 51

Arconik

First Post. Felt pretty good icl. Except last question my integrating factors and last part didn't agree and kept wanting a negative time

Reply 52

molylmaeqr23

how do you do the circle question where it was 2x-5y=-30 something like that i forgot

Reply 53

username4962864

hi guys I hope it went well for you all.

Reply 54

readre

was the first answer -128 or 128, i got -128

Reply 55

RyN05_1234

Original post by readre

was the first answer -128 or 128, i got -128

It’s 128 I’m pretty sure

(edited 10 months ago)

Reply 56

username4962864

Original post by RyN05_1234

It’s 128

did anyone get 288 to nearest cm as min value of distance between floor and ceiling?

Reply 57

SebastianEne

That exam was worryingly easy

Reply 58

pierscip

Original post by med.33333

did anyone get 288 to nearest cm as min value of distance between floor and ceiling?

i got 288cm as well :smile:

Reply 59

SebastianEne

the perpendicular line and the line that passes through the center are equal to one another then sub one point into the equation and poof comes the answer

Original post by molylmaeqr23

how do you do the circle question where it was 2x-5y=-30 something like that i forgot