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 derivatives - math problem help
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Posted on 03-20-10 1:10 PM     Reply [Subscribe]
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find the derivative of:


f(x)=ln(x+5)^(1/2)


 
Posted on 03-20-10 1:24 PM     Reply [Subscribe]
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1/2(x+5) shud be the answer... (however, please confirm yourself)


dlnx/dx = 1/x, so use chain rule as shown below,


dln(sqrt(x+5))        d(sqrt(x+5))    


__________ * ___________


d(sqrt(x+5))              dx


 
Posted on 03-20-10 1:25 PM     Reply [Subscribe]
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in fact, i shuda been clearer.... 1/ (2(x+5)) <--- answer
 
Posted on 03-20-10 1:38 PM     Reply [Subscribe]
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I think it should be (just thinking, but I would have this answer if I were asked)
1/2(x+5)-1/2

I haven't taken much of calculus and my familiarity with it is from my 11th grade where I passed maths by securing 36 in final exam :)  So, don't rely on it completely, though i believe in my solution to my knowledge, better check it by urself.


 
Posted on 03-20-10 5:53 PM     Reply [Subscribe]
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i think WTF is  correct.. i got the same answer..

 
Posted on 03-20-10 6:17 PM     Reply [Subscribe]
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Hey redlotus, when u find out correct solution, will you report it here.

because as far as I know
d ln(x+5)1/2 / dx = 1/2 (x+5)1-1/2

= .5(x+5)-1/2

 
Posted on 03-20-10 6:30 PM     Reply [Subscribe]
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hey namaskar , u better take some derivative classes!! i think u know nothing abt calculus and esp derivative....

 
Posted on 03-20-10 6:41 PM     Reply [Subscribe]
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Sports freak, I'm happy that I don't need to. Days of school overrrrrrrrrr for now. Thanx for pointing out anyway.

Ya I find something wrong with my solution

If the derivative was with respect to (x+5) i think my earlier solution would be right.

d ln(x+5)1/2 / d (x+5) = .5 (x+5)- .5

but with respect to x only nooooooo.
Sorry for giving wrong solution. My baddddddddd     :)


 
Posted on 03-20-10 6:47 PM     Reply [Subscribe]
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let me guess another soln

how about 2(sqrt X)

Pls someone post a real soln.
I am getting curious  :)
and it is boring that all other threads today in Sajha are related to dead person.

 
Posted on 03-20-10 7:11 PM     Reply [Subscribe]
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Posted on 03-20-10 7:13 PM     Reply [Subscribe]
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Last edited: 20-Mar-10 07:19 PM

 
Posted on 03-20-10 9:52 PM     Reply [Subscribe]
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Thanx raju for making it clear. Glad don't have to go thru this again :)


 


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