Implicit differentiation help...

Johanson said:
I woke up at 7pm yesterday and the exam is in 7 hours, so I'm just going through exam papers now. Thanks for the help.
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Hmmm.... you probably know best but I wouldn't sleep now. Just take it easy, I'm sure you'll do fine! :)
 
It's annoying when you forget the simple things, such as the product rule. :rolleyes: I got the answer 6x(dy/dx) + 6y btw.

Anyone who isn't doing C4 or higher must be confused by this!
 
Johanson said:
It's annoying when you forget the simple things, such as the product rule. :rolleyes: I got the answer 6x(dy/dx) + 6y btw.

Anyone who isn't doing C4 or higher must be confused by this!
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I'll do it in the morning.... (EDIT - in a minute as it is morning).

C4? isn't that explosives..... :D
 
Johanson said:
This is my last maths exam, a culmination of 2 years' work. CULMINATION!

Anyone else doing C4?
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Yeah same, c4 exam in 5hours will be my last exam.

Im glad it's almost over.
 
Johanson said:
Bloody C4 :mad:

I need to differentiate: 6xy

I get 6(dy/dx), but that ends up giving me an incorrect final answer for the question.
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Use the product rule, but remember when you're differentiating a function of y w.r.t. x you do it as though you're differentiating w.r.t. y, and then multiply by dy/dx.

I won't do your example, but if you were to differentiate x^2 + y^2 w.r.t. x, you'd get:
2x + 2y(dy/dx)
 
p4radox said:
Did you do the OCR MEI syllabus? What did you think to that comprehension paper?
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all practice comprehension paper i did were easy, but not so much on that one...
i was baffled by different equations :p

And out of all the things they could have done, why waves :(, i have a phobia of the sea
 
Johanson said:
Bloody C4 :mad:

I need to differentiate: 6xy

I get 6(dy/dx), but that ends up giving me an incorrect final answer for the question.
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As said before, differentiate with the product rule as you've got two functions, one of x and one of y. The function of y needs to be derived with respect to x so you get:

d/dx(6xy) = 6[d/dx(x)]y + 6x[d/dx(y)] = 6y + 6x(dy/dx)

Hope that helps :)
 
azamc said:
u got it easy, u should try fp2 and fp3!!!
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and fp1 too, doin all three in this next week or so! god my life feels like its gonna end this week. ive been a slave to solomen papers (assuming other maths people know what they are). c4 is a bit of b**** though in fairness, did it last year. good luck!
 
>:|sh4d0w|:< said:
Hmm I found FP1 easier than C4.
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well good for you, i'm doing a resit.. fp2 is a beauty in my eyes though i love it loads. woo we're geeks please tell me your all doing maths at uni tooo? i need friends..
 
>:|sh4d0w|:< said:
Hmm I found FP1 easier than C4.
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Depends what exam board you're doing. I'm doing OCR and FP1 doesn't have any calculus in it; mainly matrices and complex numbers, with a few other things thrown in.

bathmat said:
well good for you, i'm doing a resit.. fp2 is a beauty in my eyes though i love it loads. woo we're geeks please tell me your all doing maths at uni tooo? i need friends..
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Almost... theoretical physics & applied maths. Best of both worlds :cool:
 
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