[AquilaXenon]

(Original post by Sagacious)
In Mathematics, you will always get full marks if you get the same final answer, as long as the question doesn't specifically ask you to use a certain method; in which case you will lose marks for using an alternative method.

Okay that's great, thank you! I used substitution just went on to simplify in a different way so that should be fine. Thank you.

[kenau]

(Original post by kirstyy93)
Thanks yeah it's not so difficult but I always panic in the exam! Like in January I originally put the square root of cot^2x is cotx (which is right) but then started checking my workings half way through the question and changed it to cot^2x, which is just stupid! Haha :P

HaHa:P So this time don't change it anymore
good luck

[pleasedtobeatyou]

(Original post by ReTurd)
using a Casio fx-991ES PLUS?

i have one of these, i didnt know you could do integrations stuff on it. how?

On the top row of the "black" buttons, the second one is the Integration button.

To input "x"
1 - "ALPHA"
2 - ")"

Input your limits and then press "="

[randyunknown]

to find the range of graphs, i always find it difficult to figure it out if its an obscure graph. is it correct to simply plug in the domain limits and find what they give you, and form an inequality with that?

[pcorbett94]

(Original post by randyunknown)
to find the range of graphs, i always find it difficult to figure it out if its an obscure graph. is it correct to simply plug in the domain limits and find what they give you, and form an inequality with that?

Pretty much yes. Unless it's something like f(x)=x² where the range is f(x)≥0, as any number squared is a positive or zero.

And I did a question today where it was f(x)=x³ and the range was simply "f(x) is a member of the real numbers", which I found annoying.

[Kalv]

(Original post by pleasedtobeatyou)
On the top row of the "black" buttons, the second one is the Integration button.

To input "x"
1 - "ALPHA"
2 - ")"

Input your limits and then press "="

A calculator that does intergration?!
I really want one, the exams on thursday though. Abit late now

[darkshadow1111]

Can someone help me?
What is the range of y=1/(x-4) ?
I thought it would be YER f(X) cannot egual to 0, But apparently its not.

[ReTurd]

(Original post by darkshadow1111)
Can someone help me?
What is the range of y=1/(x-4) ?
I thought it would be YER f(X) cannot egual to 0, But apparently its not.

Yeah i think it is f(x) = any real number but not zero.
What do you mean apparently its not right? Mark scheme?

[pleasedtobeatyou]

(Original post by darkshadow1111)
Can someone help me?
What is the range of y=1/(x-4) ?
I thought it would be YER f(X) cannot egual to 0, But apparently its not.

X can be any real number but not 4 (avoiding dividing by 0)

[Mikeyyy!]

Feeling pretty confident about this exam, just a few things to touch up on.
For example:
If f(x) = 1/4x-1 between 1<x<16
and g(x) = x^2 between -4<x<-1

It asks to find fg(x) then solve it. How do you know what range of answers to give to? Do you use the f(x) domain or the g(x) domain? Sorry if this is unclear what i'm asking

[kirstyy93]

(Original post by Mikeyyy!)
Feeling pretty confident about this exam, just a few things to touch up on.
For example:
If f(x) = 1/4x-1 between 1<x<16
and g(x) = x^2 between -4<x<-1

It asks to find fg(x) then solve it. How do you know what range of answers to give to? Do you use the f(x) domain or the g(x) domain? Sorry if this is unclear what i'm asking

I did this question the other day you get x=+/-4, but the answer is -4 because of the range of g(x)
Hope that helps

[darkshadow1111]

(Original post by pleasedtobeatyou)
X can be any real number but not 4 (avoiding dividing by 0)

That is the domain. Range is y values.

[kenau]

Hey guys,I have got two questions neede help.
1. some question always give us x1,then we need to find out x2 and x3,but how do we know it is use radian or degree mode in our calculator?
2. I have got a graphical calculator which is fx-9750GII,how can I use it to check the integration and dy/dx?

[ReTurd]

Attachment 152053
Attachment 152054
Attachment 152055

hello. i need help on some questions. Even after looking at the mark schemes i still dont get them.

On the first image: part b), the last bit.
On the second image: part b)i)
On the third image: part b)

[kenau]

(Original post by Kalv)
A calculator that does intergration?!
I really want one, the exams on thursday though. Abit late now

not too late,you can order it on amazon tonight,then usually it will arrive to your home tomorrow,it have one day delivery function.But do it as soon as possible,as you need to practice as well.Hope this can help you

[JulietheCat]

(Original post by kenau)
Hey guys,I have got two questions neede help.
1. some question always give us x1,then we need to find out x2 and x3,but how do we know it is use radian or degree mode in our calculator?
2. I have got a graphical calculator which is fx-9750GII,how can I use it to check the integration and dy/dx?

For the first one, you always use radians with trig functions unless told otherwise. I'm not sure about the second one though...

[kenau]

(Original post by JulietheCat)
For the first one, you always use radians with trig functions unless told otherwise. I'm not sure about the second one though...

ok,thank you so much
How's your revise going?_? Are you ready for the exam?

[kenau]

One more qustion,How to find a range and domain?What is the different between them?Always do wrong on this question which is stupid....@@
Can anyone explain it to me?

[Mortson]

Good luck for Thursday everyone. Praying there won't be as many highly marked questions this time round!


This was posted from The Student Room's iPhone/iPad App

[SpringNicht]

Got an E in january Have a total of 332 from C1, C2, M1, D1 so need 148 for an A over C3 and C4

I agree that the range thing is a pain, I've never completely got that