Edexcel Mathematics: Core C1 6663 17th May 2017 [Exam Discussion]

just learn it lol

find the point where l1 hits the y axis (set x as 0)

Hey can someone explain to me part b of this question? I honestly have no idea what I have to do

Thanks for that, what about b? Would you mind doing a working of that too?

First of all, the clue is simply in the question and the bases.
As you can see, 3 and 9 are linked as 9 is $3^2$.
I understand why you are confused as you usually see $3^{2x+2} = 9^2$ or something like that and this time it is $1/9^{2b-6}$ lol.

So, what you need to understand is simply the basic indice rule of $x^-1 = 1/x$ or $x^-2 = 1/x^2$. In this case, it is $1/9^{2b-6}$ so that can be rewritten as $9^{-(2b-6)} = 9^{6-2b}$.

Then, I hope you can take it on from there $3^{a+4} = 9^{6-2b}$.

Hey can someone explain to me part b of this question? I honestly have no idea what I have to do

I've learnt it a while ago i was just wondering whether people thought it would come up, as it hasn't appeared in an edexcel paper since 2005.

I can explain it but give me a question ....

for eg
(5) (b) Write down the equations of the asymptotes of the curve C.
you will write what x=....?

What didn't come during 2005?

Giys quick question on inequalities. How are you meant to state ur answer when say u have a qudratic curve and the questioj says state the values of x for which its > 0? I know to factorise the qudratic ad sketcy the curve, and if the questi9j asks for greater than zero id choose the outer regions if its a positive x squared curve; but how do i write the x values.

Would it be like this

-5<x<5

Or like this

X<-5 and x>5

Or this

X<-5 , x>5

Giys quick question on inequalities. How are you meant to state ur answer when say u have a qudratic curve and the questioj says state the values of x for which its > 0? I know to factorise the qudratic ad sketcy the curve, and if the questi9j asks for greater than zero id choose the outer regions if its a positive x squared curve; but how do i write the x values.

Would it be like this

-5<x<5

Or like this

X<-5 and x>5

Or this

X<-5 , x>5

Giys quick question on inequalities. How are you meant to state ur answer when say u have a qudratic curve and the questioj says state the values of x for which its > 0? I know to factorise the qudratic ad sketcy the curve, and if the questi9j asks for greater than zero id choose the outer regions if its a positive x squared curve; but how do i write the x values.

Would it be like this

-5<x<5

Or like this

X<-5 and x>5

Or this

X<-5 , x>5

First of all, the clue is simply in the question and the bases.
As you can see, 3 and 9 are linked as 9 is $3^2$.
I understand why you are confused as you usually see $3^{2x+2} = 9^2$ or something like that and this time it is $1/9^{2b-6}$ lol.

So, what you need to understand is simply the basic indice rule of $x^-1 = 1/x$ or $x^-2 = 1/x^2$. In this case, it is $1/9^{2b-6}$ so that can be rewritten as $9^{-(2b-6)} = 9^{6-2b}$.

Then, I hope you can take it on from there $3^{a+4} = 9^{6-2b}$.

What paper is that from?

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Giys quick question on inequalities. How are you meant to state ur answer when say u have a qudratic curve and the questioj says state the values of x for which its > 0? I know to factorise the qudratic ad sketcy the curve, and if the questi9j asks for greater than zero id choose the outer regions if its a positive x squared curve; but how do i write the x values.

Would it be like this

-5<x<5

Or like this

X<-5 and x>5

Or this

X<-5 , x>5

The first way is best, i doubt you'd lose marks for representing them the other ways though.

No problem! Here's b: