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IsTimBest ResponseYou've already chosen the best response.0
I got up to this:dw:1335261401688:dw
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
Calculate the derivative of the equation, make the equation to equal, solve it and plug in your x value. Are you familiar with the quotient rule in derivatives?
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Deriatives is f'(x) right? we're not doing that yet.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Methods we're using is substitution, factoring and the conjugate method.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
I'm using the Calculus Phobe videos from Calculus Help (my teacher showed me the website and told me to use that).
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
Yes, that's correct. So you're differentiating using the definition? If you take the derivative of the equation y=3/(x^21) you can find the slope. if: f(x)=3/(x^21) then f(x+h)=3/((x+h)^21) dy/dx = (f(x+h)f(x))/h Can you do the rest?
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
dy/dx =lim (h>0) (f(x+h)f(x))/h rather.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
But I can't go any further. dw:1335262087563:dw That's the furthest I got up to.
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
Expand your brackets and factor out a h.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
The bottom one to? I was told not too.
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
Not sure  I'm not familiar with the long method, I just use the shortcut :)
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
Can you take derivatives? Must you use first principle to find it?
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Derivatives is our next unit.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
I can't isolate or factor out anything. I must had made a mistake beforehand I guess.
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
I hope you don't mind me posting my solution here
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
I guess not, but it's notm much like my work.
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
Oh shoot... I got some mistakes there! Wait
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
Oh my dear!!! The final answer should be 4/3 ... not 2 as I've written :S
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
Is your question \[\frac{3}{x^21}\] or \[\frac{3}{x^2+1}\]?
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Maybe I should upload my work, and maybe you check for problems?
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Starting from c) at Scan001.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
but since x=2, I subbed in a=2 into that equation...
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
for the denominator, (a+h)a =h , not a+h 2 You need to find the limit before substituting the numbers.
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
After you've found the limit, you'll see the unknown x. By then, sub x=2 and you'll get the slope. But NOT when you're taking the limit
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
I thought the unknown to be m, and that h was still the variable withint the equation?
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
h is something you need to deal with. Should I upload an example to should how you do first principle for you ?
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
I've got an example here with me from my teacher.
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
If you don't need it, it's okay :) Should I keep checking for you or you want to do corrections first?
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
Correct starting from the third line For numerator: a > 3/ (a^2 1) For denominator: a+h2 > h (in your previous step, a+h a, simplify it , you'll get h)
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Sorry if I sound ignorant, but that's how I saw it in the example...the h is alone.
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
Do you mind uploading your example also?
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
First, the situation is different . You're given 2 values there, but only 1 here. Second, to be frank, I don't understand what you (or your teacher) is doing. It's not the normal way as I've learnt.. Third, I still insist that you shouldn't sub the value immediately...
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Ok. I think I know what you are doing, and what my teacher is doing. You're going from a general formula, while my teacher is using the specific formula. The general formula doesn't sub in the x or a value until the end.
 one year ago

CallistoBest ResponseYou've already chosen the best response.1
It's good that you notice the difference :)
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Just looking through my notes I guess. I've got a test coming up, so I thought reviewing would be best.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
well, where do you need help with? This is pretty long..
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Maybe I should just leave this question. I tried this for over 2 hours by now.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
First, what is the question? \[\frac{1}{x2} \]?? or \[\frac{3}{x^{2}1} \]??
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Second one, whereas x=2.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Ok. Thanks for the attempt guys. I'll try other problems, and maybe this might make more sense.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
wait..i will try and do it first.. can't you take the derivative which is easier?
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Others suggested that, but that's for the next unit. I understand a bit on how that works, but I'm not allowed using it here.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
Hmm..I might try it but it might take a while since i havent done these in a while...
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Ok. Well, I guess you can do so, if yo uhave free time. But most likely you too have something important coming up (immediately).
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
No, I don't have anything important..i might be able to do it but not sure..lol
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
I have to review these anyway
 one year ago

apoorvkBest ResponseYou've already chosen the best response.0
^^That was mammoth. phew. Istim do you know how to differentiate using chain rule?
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
lol, i failed...do you remember how to do these apoor? my brain is failling me :(
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
No, I don't (Sorry, cleaning up house).
 one year ago

apoorvkBest ResponseYou've already chosen the best response.0
Hmm. so you want to do this by the first principle of finding derivatives okay.
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
I am just oh so selective in the method used. That be the end of me.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
\[\large\frac{f(x+h)f(x)}{h} =>\frac{\frac{3}{(x+h)^{2}1}\frac{3}{x^{2}1}}{h} \]
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
should be the limit as h approaches zero, but, apart from that, correct. ^_^
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
\[\large =>\frac{\frac{3}{h^{2}+2hx+x^{2}1}\frac{3}{x^{2}1}}{h} \] \[\large >\frac{\frac{3(x^{2}1)3(h^{2}+2hx+x^{2}1)}{(h^{2}+2hx+x^{2}1)(x^{2}1)}}{h} \]
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
I think that im doing it wrong..i dont think that its this complicated..
 one year ago

chaiseBest ResponseYou've already chosen the best response.2
Perhaps you should just use quotient rule.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
but it says derivatiive thing is not allowed..
 one year ago

IsTimBest ResponseYou've already chosen the best response.0
Before using deratives. Referencing Calculus Phobe from Calculus Help. I think I used Conjugate Method.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
whaat..im lost..i looked at your example but it got confusing..then i looked at my book its more confusing..using the chain rule is easier.
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.2
\[\frac{3}{x^{2}1} => 3(x^21)^{1}\] \[3(x^21)^{1}*2x \] \[6x(x^21)^{1}\] easier i suppose..
 one year ago
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