Mathematics: Post your doubts here!

[Ram97]

View attachment 53119
Yeah but then how come it doesn't work with chain rule... :/
See if you substitute x=16, the numerator becomes 0, so the whole thing just gives 0 .... thats wrong... have i integrated wrong?

U need to first square the equation given
if y=4x +2
so it becomes y^2=16x^2+16x+4
Now you'll integrate it

 

[Ram97]

Good
Chem is what I'm worried about most!
Wbu?
BTW Good luck!

Good. Well most of the P1's are quite same so im bit bored doing them
Good Luck for Chem and Maths!

 

[nehaoscar]

U need to first square the equation given
if y=4x +2
so it becomes y^2=16x^2+16x+4
Now you'll integrate it

Yeah thats the safe way of doing it... but then when you don't expand the bracket it doesn't work... so i was just wondering why it doesn't work...

 

[DESTROYER1198]

AM is (OM - OA).
OA is 8i
View attachment 53080

Thanx

 

[DeadlYxDemon]

Thanx

You're welcome

 

[The Sarcastic Retard]

Hey guys, can anyone help me out with Q3 (i)? Thank you!

9x^2 - 12x + 5
9(x^2 - 12/9(x) + 5/9)
9[(x - 2/3)^2 + 1/9)
9(x - 2/3)^2 + 1
This can be also written as (3x - 2)^2 + 1

 

[The Sarcastic Retard]

Good luck guys

 

[classicmba]

Guys ..
I have a question is calculator 991EX allowed for paper 1

 

[The Sarcastic Retard]

Guys ..
I have a question is calculator 991EX allowed for paper 1

Yes. It is allowed. It only does numerical integration and differentiation, therefore it is allowed, it doesn't do symbolic integration/differentiation

 

[The Sarcastic Retard]

Practice this paper : http://themathelp.com/pdf/a level p1.pdf
Just dont look at answers, some are wrong and answers to Q7 is missing.
Just where you feel your answer is not matching the answer, post it here. We'll discuss together.

 

[Debonny1]

In paper 3 how do we obtain the modulus and argument?

 

[The Sarcastic Retard]

In paper 3 how do we obtain the modulus and argument?

http://www.examsolutions.net/maths-revision/syllabuses/CIE/period-1/P3/module.php 1st chapter.

 

[kitkat <3 :P]

How are we going to do Q2 a part

Practice this paper : http://themathelp.com/pdf/a level p1.pdf
Just dont look at answers, some are wrong and answers to Q7 is missing.
Just where you feel your answer is not matching the answer, post it here. We'll discuss together.

 

[The Sarcastic Retard]

How are we going to do Q2 a part

So long, lemme remember ur name, asma ryt?
According to me a = 2 and b = 25
This is how it goes :¬
b - (x - 1)^2
b - (x^2 - 2x + 1)
b - x^2 + 2x - 1
-x^2 + 2x + (b - 1)
We know that c(ax^2 + bx + c) = 24
So b - 1 = 24 ; b 25.
25 - (x - 1)^2
Opening this, we get 24 + 2x - x^2. so a = 2.

 

[kitkat <3 :P]

Yep thanks can you do Q4 a part too :'(

So long, lemme remember ur name, asma ryt?
According to me a = 2 and b = 25
This is how it goes :¬
b - (x - 1)^2
b - (x^2 - 2x + 1)
b - x^2 + 2x - 1
-x^2 + 2x + (b - 1)
We know that c(ax^2 + bx + c) = 24
So b - 1 = 24 ; b 25.
25 - (x - 1)^2
Opening this, we get 24 + 2x - x^2. so a = 2.

 

[kitkat <3 :P]

Never mind I got it

 

[DeadlYxDemon]

Exam in 3 hrs!!!

 

[kitkat <3 :P]

And I feel I don't Know anything

 

[The Sarcastic Retard]

Never mind I got it

How you do this? :/

 

[The Sarcastic Retard]

Exam in 3 hrs!!!

And I feel I don't Know anything

Be strong and confident about the concepts you have grasped in you.
Do well. Good luck. ^_^