Comments on: Y13 C3 Differentiation Revision Questions http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/ Thu, 09 Sep 2010 21:01:01 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Grace Mullally http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6323 Grace Mullally Tue, 19 Jan 2010 22:16:55 +0000 http://www.shsmaths.com/?p=1408#comment-6323 ooh typo :) (the third triangle has two sides of 1 and the 3rd side is root2) ooh typo :) (the third triangle has two sides of 1 and the 3rd side is root2)

]]> By: Grace Mullally http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6321 Grace Mullally Tue, 19 Jan 2010 22:15:17 +0000 http://www.shsmaths.com/?p=1408#comment-6321 Just to jump in here, Jas, You can work out all the trig angles by drawing the three triangles (If I think you're talking about the sheet I'm thinking about) The first triangle is an equilateral split down the middle (so the sides are 2, 1 and root3 - it gives the 60 and 30 angles) The second is a 3,4,5 triangle - that gives you any angle The third is an isos - two sides of 1 and the 3rd root (angle 45) Is that the one?? xxx Just to jump in here, Jas, You can work out all the trig angles by drawing the three triangles (If I think you’re talking about the sheet I’m thinking about)

The first triangle is an equilateral split down the middle (so the sides are 2, 1 and root3 – it gives the 60 and 30 angles)
The second is a 3,4,5 triangle – that gives you any angle
The third is an isos – two sides of 1 and the 3rd root (angle 45)

Is that the one??
xxx

]]> By: Jacynth http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6310 Jacynth Tue, 19 Jan 2010 20:41:59 +0000 http://www.shsmaths.com/?p=1408#comment-6310 Great thankyou! Jacynth Great thankyou!

Jacynth

]]> By: Mrs Tibble http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6308 Mrs Tibble Tue, 19 Jan 2010 20:38:47 +0000 http://www.shsmaths.com/?p=1408#comment-6308 Hi Jacynth, Find 2 consecutive integers which give a sign change for the function. Start your iteration with one of them. If your first iteration makes the value worse - ie you move away from the interval, then start again with the other one. JT Hi Jacynth,
Find 2 consecutive integers which give a sign change for the function. Start your iteration with one of them. If your first iteration makes the value worse – ie you move away from the interval, then start again with the other one.
JT

]]> By: Jacynth http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6307 Jacynth Tue, 19 Jan 2010 20:28:30 +0000 http://www.shsmaths.com/?p=1408#comment-6307 Thank you! i understand now! no it just wanted you to find the root with the iterative formula. the denominator is (x^2 + 1). it wants you to find a suitable starting value but im not sure how to work that out also for Mr Brewin: Sir i've mislaid the sheet you wrote us out on all the different values we need to know for trig. would you be able to send me another copy please as i am frantically trying to find it but i cant :/ Thanks Jacynth Thank you! i understand now!

no it just wanted you to find the root with the iterative formula. the denominator is (x^2 + 1). it wants you to find a suitable starting value but im not sure how to work that out

also for Mr Brewin: Sir i’ve mislaid the sheet you wrote us out on all the different values we need to know for trig. would you be able to send me another copy please as i am frantically trying to find it but i cant :/

Thanks

Jacynth

]]> By: Mrs Tibble http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6296 Mrs Tibble Tue, 19 Jan 2010 18:48:54 +0000 http://www.shsmaths.com/?p=1408#comment-6296 Hi Jacynth, Did you have to show that there was a root in the interval 2-3 or 3-4 as the 1st part of the question? Also, is it (1/x^2) + 1 or is the denominator (x^2 + 1) Hi Jacynth,
Did you have to show that there was a root in the interval 2-3 or 3-4 as the 1st part of the question?
Also, is it (1/x^2) + 1 or is the denominator (x^2 + 1)

]]> By: Mrs Tibble http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6295 Mrs Tibble Tue, 19 Jan 2010 18:44:57 +0000 http://www.shsmaths.com/?p=1408#comment-6295 Hi Jacynth, 2nd question first: because 'log' is the shorthand for logs to base 10, whereas 'ln' is to base e; it's the change of base formula. JT Hi Jacynth,
2nd question first: because ‘log’ is the shorthand for logs to base 10, whereas ‘ln’ is to base e; it’s the change of base formula.
JT

]]> By: Jacynth http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6291 Jacynth Tue, 19 Jan 2010 18:08:55 +0000 http://www.shsmaths.com/?p=1408#comment-6291 Also, why does logx = lnx/ln10 please? Also, why does logx = lnx/ln10 please?

]]> By: Jacynth http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6289 Jacynth Tue, 19 Jan 2010 17:57:39 +0000 http://www.shsmaths.com/?p=1408#comment-6289 Hi please may i have some help with this question: Use the iterative formula xn+1 = 2 + (1/xn^2 + 1) with a suitable starting value to find the root of the equation f(x) = 0 correct to 3 significant figures and justify the accuracy of your answer. I understand how to work it out, Im just not sure on how to work out a 'suitable starting value'. The mark scheme recommends it to be 3 but i dont know why this is. Thanks Jacynth Hi please may i have some help with this question:

Use the iterative formula

xn+1 = 2 + (1/xn^2 + 1)

with a suitable starting value to find the root of the equation f(x) = 0 correct to 3 significant figures and justify the accuracy of your answer.

I understand how to work it out, Im just not sure on how to work out a ‘suitable starting value’. The mark scheme recommends it to be 3 but i dont know why this is.

Thanks

Jacynth

]]> By: Mrs Tibble http://www.shsmaths.com/2009/12/y13-c3-differentiation-revision-questions/comment-page-1/#comment-6227 Mrs Tibble Sun, 10 Jan 2010 15:26:06 +0000 http://www.shsmaths.com/?p=1408#comment-6227 Bernice, Check your school e-mail. JT Bernice,
Check your school e-mail.
JT

]]>