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# AQA MPC3 31/05/12 revision thread AQA Tweet

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1. Re: AQA MPC3 31/05/12 revision thread AQA
(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.
2. Re: AQA MPC3 31/05/12 revision thread AQA
(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
3. Re: AQA MPC3 31/05/12 revision thread AQA
(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 "="
4. Re: AQA MPC3 31/05/12 revision thread AQA
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?
5. Re: AQA MPC3 31/05/12 revision thread AQA
(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.
6. Re: AQA MPC3 31/05/12 revision thread AQA
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
7. Re: AQA MPC3 31/05/12 revision thread AQA
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.
8. Re: AQA MPC3 31/05/12 revision thread AQA
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?
9. Re: AQA MPC3 31/05/12 revision thread AQA
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)
10. Re: AQA MPC3 31/05/12 revision thread AQA
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
11. Re: AQA MPC3 31/05/12 revision thread AQA
(Original post by Mikeyyy!)
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
12. Re: AQA MPC3 31/05/12 revision thread AQA
X can be any real number but not 4 (avoiding dividing by 0)
That is the domain. Range is y values.
13. Re: AQA MPC3 31/05/12 revision thread AQA
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?
14. Re: AQA MPC3 31/05/12 revision thread AQA
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)
15. Re: AQA MPC3 31/05/12 revision thread AQA
(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
16. Re: AQA MPC3 31/05/12 revision thread AQA
(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...
17. Re: AQA MPC3 31/05/12 revision thread AQA
(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
18. Re: AQA MPC3 31/05/12 revision thread AQA
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?
19. Good luck for Thursday everyone. Praying there won't be as many highly marked questions this time round!

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20. Re: AQA MPC3 31/05/12 revision thread AQA
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
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