Maths 
Maths 
Sep 19 2007, 04:21 AM
Post
#1


Get to da Chopper! Group: GMC Senior Posts: 2.700 Joined: 18March 07 From: South Wales, UK Member No.: 1.374 
Anyone out there enjoy a good number crunch? I'm doing Alevel maths and am staring blankly at a piece of paper holding a set of questions i just can't do.
just to see how many of you like / can do maths i'll throw one out and see how it goes.... (maybe your proof will help me understand) Show that the equation of the tangent to the curve y=7x^2  2e^x at the point where x=2 is y=(28  2e^2)x + 2e^2  28. Cheers for your help....if you can handle it ( evil laugh fading out......) 


Sep 19 2007, 04:44 AM
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#2


GMC:er Group: Members Posts: 616 Joined: 25July 07 From: NY Member No.: 2.393 
The answer is 42.
Hope you get the reference I'd honestly love to help but that looks like someone fell on a keyboard a few times . 


Sep 19 2007, 04:45 AM
Post
#3


GMC:er Group: Members Posts: 1.533 Joined: 28March 07 From: Luleå, Sweden Member No.: 1.434 
Anyone out there enjoy a good number crunch? I'm doing Alevel maths and am staring blankly at a piece of paper holding a set of questions i just can't do. just to see how many of you like / can do maths i'll throw one out and see how it goes.... (maybe your proof will help me understand) Show that the equation of the tangent to the curve y=7x^2  2e^x at the point where x=2 is y=(28  2e^2)x + 2e^2  28. Cheers for your help....if you can handle it ( evil laugh fading out......) I dnt get the bends really. Can you tab it for me?  Schecter C1 Hellraiser EMG 81/85, replaced with JB/Jazz (SH4/SH2n) w. coilsplit Schecter Revenger HB105, replaced with EMG 81/85 Stratocaster Deluxe Players Noiseless Ibanez 2550z Blackstar HT5H, Blackheart BH5H w. BH112, Laney LX35D, Line6 Pod XT, Marshall MS2 Headphones: Sennheiser RS120 Stay tuned... 


Sep 19 2007, 04:50 AM
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#4


Get to da Chopper! Group: GMC Senior Posts: 2.700 Joined: 18March 07 From: South Wales, UK Member No.: 1.374 
i guess you guys see this and think the same as i do "screw this i'm grabbing my guitar".
At this point in the course thats a bad thing for me to be thinking..... @ Ayen : yeh i get the reference and that thing hitting the keyboard was my head @ blindwillie : this type of bend is often a problem for guitarists that arent nerds just ask your nearest maths teacher for details on this issue 


Sep 19 2007, 04:53 AM
Post
#5


GMC:er Group: Members Posts: 1.533 Joined: 28March 07 From: Luleå, Sweden Member No.: 1.434 
i guess you guys see this and think the same as i do "screw this i'm grabbing my guitar". At this point in the course thats a bad thing for me to be thinking..... @ Ayen : yeh i get the reference and that thing hitting the keyboard was my head @ blindwillie : this type of bend is often a problem for guitarists that arent nerds just ask your nearest maths teacher for details on this issue Sorry for making a joke of it, just couldn't resist. I'm to no help. I've been through this but I found it boooring and tideous and that stuff didn't stick.  Schecter C1 Hellraiser EMG 81/85, replaced with JB/Jazz (SH4/SH2n) w. coilsplit Schecter Revenger HB105, replaced with EMG 81/85 Stratocaster Deluxe Players Noiseless Ibanez 2550z Blackstar HT5H, Blackheart BH5H w. BH112, Laney LX35D, Line6 Pod XT, Marshall MS2 Headphones: Sennheiser RS120 Stay tuned... 


Sep 19 2007, 04:54 AM
Post
#6


Get to da Chopper! Group: GMC Senior Posts: 2.700 Joined: 18March 07 From: South Wales, UK Member No.: 1.374 
Sorry for making a joke of it, just couldn't resist. I'm to no help. I've been through this but I found it boooring and tideous and that stuff didn't stick. amen to that... cheers anyway 


Sep 19 2007, 05:19 AM
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#7


GMC:er Group: Members Posts: 1.255 Joined: 12April 07 Member No.: 1.545 
Don't you just derivate (if it's called that in english, I just made that up) it and put x = 2? And then it's done?
I'm sorry if I'm no help, because since you're doing Alevel maths (I suppose on university level), the solution must be harder than that, but it looked so easy.. I don't know. Hope I helped, otherwise just ignore me:p 


Sep 19 2007, 05:22 AM
Post
#8


GMC:er Group: Members Posts: 202 Joined: 22May 07 Member No.: 1.906 
Anyone out there enjoy a good number crunch? I'm doing Alevel maths and am staring blankly at a piece of paper holding a set of questions i just can't do. just to see how many of you like / can do maths i'll throw one out and see how it goes.... (maybe your proof will help me understand) Show that the equation of the tangent to the curve y=7x^2  2e^x at the point where x=2 is y=(28  2e^2)x + 2e^2  28. Cheers for your help....if you can handle it ( evil laugh fading out......) I'll take a shot. First differentiate y with respect to x using your first equation. This results in dy/dx = 14x  2e^x and represents the gradient (tangent) at any point. Since we're interested in x=2, plug this value into dy/dx to get a gradient of m = 28  2e^2. Since the equation of a straight line is y = mx + c, and we've just found m, we only now need to find the Yaxis intercept c. But we know we've got a straight line passing through the point x=2, y=28  2e^2 (from your first equation) AND it has a gradient of 28  2e^2. Therefore the line crosses the Y axis at (28  2e^2) or equivalently 2e^2  28 and gives us the value of c. So, the equation of the tangent at x=2 is therefore y = (28  e^2)x + 2e^2  28 which agrees with the second equation in your post. Best of luck in your exam!  QUOTE If you think you can, you can. And if you think you can't, you're right. 


Sep 19 2007, 07:03 PM
Post
#9


Lets go fishing! Group: GMC Senior Posts: 5.526 Joined: 21December 06 From: illinois Member No.: 1.001 
I'll take a shot. First differentiate y with respect to x using your first equation. This results in dy/dx = 14x  2e^x and represents the gradient (tangent) at any point. Since we're interested in x=2, plug this value into dy/dx to get a gradient of m = 28  2e^2. Since the equation of a straight line is y = mx + c, and we've just found m, we only now need to find the Yaxis intercept c. But we know we've got a straight line passing through the point x=2, y=28  2e^2 (from your first equation) AND it has a gradient of 28  2e^2. Therefore the line crosses the Y axis at (28  2e^2) or equivalently 2e^2  28 and gives us the value of c. So, the equation of the tangent at x=2 is therefore y = (28  e^2)x + 2e^2  28 which agrees with the second equation in your post. Best of luck in your exam! Well Im impressed  mysql> SELECT * FROM master_name WHERE ((firstname = 'Paul') AND (lastname = 'Gilbert'));
"The Fundimental Difference between Paul Gilbert and Buckethead is that Paul Explores the Good side of the force, while Buckethead Explores the Dark Side of the Force" :) 


Sep 19 2007, 08:30 PM
Post
#10


Get to da Chopper! Group: GMC Senior Posts: 2.700 Joined: 18March 07 From: South Wales, UK Member No.: 1.374 
I'll take a shot. First differentiate y with respect to x using your first equation. This results in dy/dx = 14x  2e^x and represents the gradient (tangent) at any point. Since we're interested in x=2, plug this value into dy/dx to get a gradient of m = 28  2e^2. Since the equation of a straight line is y = mx + c, and we've just found m, we only now need to find the Yaxis intercept c. But we know we've got a straight line passing through the point x=2, y=28  2e^2 (from your first equation) AND it has a gradient of 28  2e^2. Therefore the line crosses the Y axis at (28  2e^2) or equivalently 2e^2  28 and gives us the value of c. So, the equation of the tangent at x=2 is therefore y = (28  e^2)x + 2e^2  28 which agrees with the second equation in your post. Best of luck in your exam! wow. that was an awesome explanation. thanks alot ressurrection! much better than my teacher i hope you dont mind me pestering you via PM for when i get stuck next time. Great help This post has been edited by DeepRoots: Sep 19 2007, 08:32 PM 


Sep 19 2007, 11:48 PM
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#11


Moderation Policy Director Group: GMC Instructor Posts: 10.459 Joined: 6February 07 From: CT, USA Member No.: 1.167 
i hope you dont mind me pestering you via PM for when i get stuck next time. No good deed ever goes unpunished ...  Check out my Instructor profile
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Sep 19 2007, 11:54 PM
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#12


Get to da Chopper! Group: GMC Senior Posts: 2.700 Joined: 18March 07 From: South Wales, UK Member No.: 1.374 



Sep 20 2007, 01:04 AM
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#13


GMC:er Group: Members Posts: 2.570 Joined: 20February 07 Member No.: 1.226 
.
This post has been edited by botoxfox: Feb 21 2011, 03:59 PM 


Sep 20 2007, 01:25 AM
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#14


Instructor Group: Passive Posts: 3.764 Joined: 8January 07 From: Rijeka, Croatia Member No.: 1.055 
Maths? You gotta be kidding!
I would be of better use in sweeps than in maths  "It isn't how many years you have been playing, it's how many hours."  Prashant Aswani "PRACTICE, PRACTICE, PRACTICE!"  Michael Angelo Batio Check out my video lessons and instructor board! 


Sep 20 2007, 02:06 AM
Post
#15


GMC:er Group: Members Posts: 1.737 Joined: 14April 07 From: Karmiel, Israel Member No.: 1.574 
If you asked me this 2 years ago I would have had an answear for you, but I forgot all my math now.



Sep 20 2007, 06:56 AM
Post
#16


GMC:er Group: Passive Posts: 2.442 Joined: 11June 07 From: Honduras Member No.: 2.062 
This thread made me remember how much I hate math. yeah i hate it too!!!!!  Playing Guitar Since: December 2006 


Sep 23 2007, 07:02 PM
Post
#17


GMC:er Group: Members Posts: 202 Joined: 22May 07 Member No.: 1.906 
wow. that was an awesome explanation. thanks alot ressurrection! much better than my teacher i hope you dont mind me pestering you via PM for when i get stuck next time. Great help Glad to have been of help. To all the other posters, how can you possibly hate mathematics? Seriously though, most of it is getting to grips with terminology, technique and the proper frame of mind. Kinda like guitar playing  QUOTE If you think you can, you can. And if you think you can't, you're right. 


Sep 23 2007, 07:46 PM
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#18


GMC:er Group: Members Posts: 2.570 Joined: 20February 07 Member No.: 1.226 
I just find mathematics boring, I wish I didn't, but I just do. I kinda feel that numbers hate me. They just jump up from the paper like shrapnel into my face.



Sep 23 2007, 08:36 PM
Post
#19


Lets go fishing! Group: GMC Senior Posts: 5.526 Joined: 21December 06 From: illinois Member No.: 1.001 
Im probably as poor in mathematics as you can get Not because I don’t feel i have the intelligence, rather I wasn’t given the opportunity in school to learn as my class size was huge and teachers rarely turned up
 mysql> SELECT * FROM master_name WHERE ((firstname = 'Paul') AND (lastname = 'Gilbert'));
"The Fundimental Difference between Paul Gilbert and Buckethead is that Paul Explores the Good side of the force, while Buckethead Explores the Dark Side of the Force" :) 


Sep 23 2007, 08:53 PM
Post
#20


Moderator  low level high stakes Group: GMC Senior Posts: 6.173 Joined: 27June 07 From: Espania  Cadiz province Member No.: 2.194 
Rightly or wrongly if you want to study any science or science related subject post 16 then a good grounding in maths and/or stats is pretty much a prerequisite.
In the UK in the past you also needed a pass at what was then "O" level grade C (or CSE grade 1) in both English and Maths in addition to the required grades for subjects studies at 'A' level to enter University. My wife had to take her "o" level maths several times to get the pass mark so that she could go to uni despite v good grades in her 'a' levels . Have to say that even now it's me that helps our daughter with her maths homework lol: . Cheers, Tony  Get your music professionally mastered by anl AES registered Mastering Engineer. Contact me for Audio Mastering Services and Advice and visit our website www.miromastering.com
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