Edexcel C3,C4 June 2013 Thread

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Is there a way to check your answers in C4 if you are wrong or right?

If you're doing past papers you can use the mark schemes?

In the real thing, not really, apart from questions with the trapezium rule - if you evaluate a definite integral your answer should be close to the approximation from the trapezium rule, if not something has most likely gone wrong.

Reply 4381

Student-95

Original post by otrivine

Is there a way to check your answers in C4 if you are wrong or right?

If you have a graphical calculator then you can easily check definite integrals and you can check indefinite integrals by plotting a graph or making up the limits.

Reply 4382

TDL

if you have one of those calculators that can integrate, you can check your answers for partial fractions, all the integration questions, and some of the vector questions as well as SOME differentiation questions.

If you don't, then you can't really.

Reply 4383

otrivine

Original post by Student-95

If you have a graphical calculator then you can easily check definite integrals and you can check indefinite integrals by plotting a graph or making up the limits.

I have the normal casio FX-83ES ?

Reply 4384

usycool1

Original post by Matt_payne

Has anybody tried the "practise paper" in the textbook? If so, can you help me with question 5b), I've got it in the form p=Ae^(kt) but can't go any further, is there a mistake in the text book?

No, it's not a mistake :nah:

You can write it as:

P =

Unparseable latex formula:

A(e^{k})^t}

e^k

is just a constant, so let it equal "k" (although it would have been better to let it equal another letter).

So:

P =

Ak^t

Reply 4385

Knoyle quiah

Original post by otrivine

Is there a way to check your answers in C4 if you are wrong or right?

can check EVERYTHING with the silver casio fx 991ES plus, best calculator

Reply 4386

BearOfStown

Original post by Knoyle quiah

can check EVERYTHING with the silver casio fx 991ES plus, best calculator

Worship the mighty silv!

Reply 4387

Student-95

Original post by otrivine

I have the normal casio FX-83ES ?

As far as I am aware that one doesn't have an integration function.

Reply 4388

nicole.94

Original post by Knoyle quiah

can check EVERYTHING with the silver casio fx 991ES plus, best calculator

Original post by BearOfStown

Worship the mighty silv!

Maybe I should have this calculator for tomorrow rather than my bog standard Casio which I have had since year 9.....

Reply 4389

Econ1994

how do you check definite integrals with the graphical silver calc? x

Reply 4390

BearOfStown

Original post by Econ1994

how do you check definite integrals with the graphical silver calc? x

Use the integral function, it's just below the fraction button. Sub in the equation, the limits and boom you're away. Works with trig although will lag a little.

Reply 4391

lefterispower

who is nervous about the replacement paper?? :s-smilie:

Reply 4392

orange94

Original post by otrivine

In integration, how can you check if your answer is correct?

Differentiate!

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Reply 4393

Air1337

Original post by lefterispower

who is nervous about the replacement paper?? :s-smilie:

Why would you be nervous? It's the paper they would have put for June 2014.

Reply 4394

lefterispower

Original post by Air1337

Why would you be nervous? It's the paper they would have put for June 2014.

xmm i didnt know that...now i feel better!! :smile:

Reply 4395

orange94

It's only numerical integration with those Casio silver not algebraic will only be useful I assume with limits with the integral!

If you have algebraic calculator that's not allowed in exam only numerical!

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