New Posts For Thread: Help needed off the maths minds pleasehttps://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-pleaseCan anyone help with this question pleaseDifferentiate x^(1/2) from first principles. [10 marks]I got as far as:dy lim sqrt(x + h) - sqrt(x)-- = ----------------------dx h=>0 h(not very far I know!!)but am stuck after thatcheersah. I misunderstood your first post. I thought you were suggesting to mmultiply out (x+h)^1/2 uing binomial. I ended up doing it the same way as you. Thanks for your help, appreciated.https://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479111733#479111733ah. I misunderstood your first post. I thought you were suggesting to mmultiply out (x+h)^1/2 uing binomial. I ended up doing it the same way as you. Thanks for your help, appreciated.Thu, 23 Dec 2010 07:28:47 -0600It's the difference of two squares.you can make your equation((x+h)^1/2-(x^1/2))((x+h)^1/2+x^1/2)) all divided by h((x+h)^1/2+x^1/2)) perfectly ok to do that algebraicly as you are multiplying by 1.simplified down that gets you to x+h-x/h((x+h)^1/2+xhttps://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479110381#479110381It's the difference of two squares.you can make your equation((x+h)^1/2-(x^1/2))((x+h)^1/2+x^1/2)) all divided by h((x+h)^1/2+x^1/2)) perfectly ok to do that algebraicly as you are multiplying by 1.simplified down that gets you to x+h-x/h((x+h)^1/2+xThu, 23 Dec 2010 07:08:27 -0600done it.. multiplied the fraction by (sqrt(x + h) + sqrt(x)) to get h/[h(sqrt(x + h) + sqrt(x)] which leaves 1/(sqrt(x + h) + sqrt(x))... rest is trivialhttps://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479109453#479109453done it.. multiplied the fraction by (sqrt(x + h) + sqrt(x)) to get h/[h(sqrt(x + h) + sqrt(x)] which leaves 1/(sqrt(x + h) + sqrt(x))... rest is trivialThu, 23 Dec 2010 06:54:54 -0600aussi your approach is what I normally try however it doesn't really work for fractional powers cos you can't simplify the brackets.https://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479107837#479107837aussi your approach is what I normally try however it doesn't really work for fractional powers cos you can't simplify the brackets.Thu, 23 Dec 2010 06:26:59 -0600Maths minds on Betfair...you are having a laughhttps://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479106741#479106741Maths minds on Betfair...you are having a laughThu, 23 Dec 2010 06:03:04 -0600https://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479106245#479106245Thu, 23 Dec 2010 05:53:02 -0600it's not sqrt (x+h) it's f(x+h) same with the x termdefine f(x)=x^1/2therefore f(x+h)= (x+h)^1/2seperate the terms from the brackets and then sub into to your lim equationyour h term on the bottom will cancel out leaving you with just a simple equatihttps://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479101389#479101389it's not sqrt (x+h) it's f(x+h) same with the x termdefine f(x)=x^1/2therefore f(x+h)= (x+h)^1/2seperate the terms from the brackets and then sub into to your lim equationyour h term on the bottom will cancel out leaving you with just a simple equatiThu, 23 Dec 2010 04:07:27 -0600Can anyone help with this question pleaseDifferentiate x^(1/2) from first principles. [10 marks]I got as far as:dy lim sqrt(x + h) - sqrt(x)-- = ----------------------dx h=>0 h(not very far I know!!)but am stuck after thatcheershttps://community.betfair.com/general_betting/go/thread/view/94082/26504369/help-needed-off-the-maths-minds-please?post_id=479067425#479067425Can anyone help with this question pleaseDifferentiate x^(1/2) from first principles. [10 marks]I got as far as:dy lim sqrt(x + h) - sqrt(x)-- = ----------------------dx h=>0 h(not very far I know!!)but am stuck after thatcheersWed, 22 Dec 2010 18:38:53 -0600