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Edexcel A2 C3 Mathematics 12th June 2015

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Reply 480
Avatar for Tplox
Tplox
2
Anyone know a method to always be able to find the range and domain for any equation?
Never quite get them :/


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Original post by Tplox
Anyone know a method to always be able to find the range and domain for any equation?
Never quite get them :/


Posted from TSR Mobile


it varies depending on the question, there's no formulae or equation that works for all :smile: Maybe if you have specific questions you can put them up
it seems silly but the thing i find hardest in c3 is sketching inverse functions even though I know that it's a reflection in y=x and that when you do this the x and y co-ordinates of any point switch around. i just find it hard to visualise the reflection. Any tips for this?
Original post by arsenalfc97
it seems silly but the thing i find hardest in c3 is sketching inverse functions even though I know that it's a reflection in y=x and that when you do this the x and y co-ordinates of any point switch around. i just find it hard to visualise the reflection. Any tips for this?


i find sketching the modulus graphs a bit hard and finding ranges of fg(x) ugh can someone tell me if there's a good way to find range of a function given the domain?
I'm very confident for c3, I aiming for 100ums!
Original post by Ripper Phoenix
i find sketching the modulus graphs a bit hard and finding ranges of fg(x) ugh can someone tell me if there's a good way to find range of a function given the domain?


Find the range, usually plug in the smallest value of the domain into the equation, it'll give you the range
draw the graph as well it really helps!
what are you stuck on with modulus graphs? if it's mod the whole f(x) you delete below x, and reflect it
if it's mod of x in the f(x) function, you just delete the left of the y axis and reflect the right in the line x=0
Reply 486
Avatar for lam12
lam12
2
How do you guys control nerves? I have a lot of potential but in the exams for maths I always seem to underperform even though I've worked so hard, it's really frustrating, any tips please!


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Reply 487
Avatar for RK1998
RK1998
5
Original post by Tplox
Anyone know a method to always be able to find the range and domain for any equation?
Never quite get them :/


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A quick sketch of the graph could be helpful :smile:
Original post by lam12
How do you guys control nerves? I have a lot of potential but in the exams for maths I always seem to underperform even though I've worked so hard, it's really frustrating, any tips please!


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If you prepare well, they cannot ask you a single question you don't know how to answer. Even if they ask you a 'weird' question its just matter of working out what bit of knowledge (which you have if you prepare well) they want you to apply. Reminding myself of this usually means I am pretty calm in maths exams

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Reply 490
Avatar for lam12
lam12
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Original post by samb1234
If you prepare well, they cannot ask you a single question you don't know how to answer. Even if they ask you a 'weird' question its just matter of working out what bit of knowledge (which you have if you prepare well) they want you to apply. Reminding myself of this usually means I am pretty calm in maths exams

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When you're in the exam what do you do if you don't know how to answer a question. I move a lot around the paper which I think is quite bad for me as it makes me more nervous but yeah


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Original post by samb1234
My calculator has the ability to do numerical differentiation. I pick a value of x, work out what the output from my derivative that I have just worked out is for that value of x. I then type the original equation given in the question into my calculator, and tell it to work out the gradient for the same value of x. If both answers are the same, therefore my differentiation must be correct

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You're not allowed a calculator like that in your exam!!
Original post by rayquaza17
You're not allowed a calculator like that in your exam!!


Yes you are. You can't have a calculator that does symbolic calculus but numerical is fine

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Original post by samb1234
Yes you are. You can't have a calculator that does symbolic calculus but numerical is fine

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Fx 991es?

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Original post by Krollo


Yes

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Original post by samb1234


I must say it's absolutely brilliant. Summing series, dot product, matrix multiplication, integration, differentiation... The list goes on

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Original post by Krollo
I must say it's absolutely brilliant. Summing series, dot product, matrix multiplication, integration, differentiation... The list goes on

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I agree its very good for checking answers

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Original post by Krollo


What a don of a calculator :wink:
Reply 498
Avatar for RK1998
RK1998
5
Original post by lam12
When you're in the exam what do you do if you don't know how to answer a question. I move a lot around the paper which I think is quite bad for me as it makes me more nervous but yeah


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Same here..
Hi guys I'm really struggling with domain and range questions can anyone help me with the first one I have worked out the inverse function. But not sure how to do the domain and range. Thanks image.jpg

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