Can anyone help me with a very difficult First year calculus problem?

webnewland

Golden Member
Apr 21, 2001
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The problem is located at http://24.76.230.229/math.jpg

for f(0) I got rather quickly, but f(1) was very difficult.
The answer I got was sqr(75/13)

First i found out what the integral equal to, so i isolated the integral and got (5/f(x)) - 1

I took the derivitive of both side of the original equation, and substituting the integral with (5/f(x)) - 1

After that, I moved all the x and dx to one side and f(x) and df to the other side and used separable differential equation

and then plugging in x=0 to find out the C that came out of the integration and then plug in x=1 to find the final answer.

Can anyone check if I am doing it correctly and whether the answer is sqr(75/13)?

Thanks a lot in advance
 

blueghost75

Golden Member
Dec 12, 2000
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doh.....I forgot how to do that already...:D

we just finished up for the year, and are going to be reviewing everything for the AP test...:Q

I recall having trouble with that particular section though.

Got any other not-so-hard Qs? :D
 

webnewland

Golden Member
Apr 21, 2001
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heh, ya it's quite difficult. That is the only question I have right now, final is coming for me also and i'm not very confident right now
 

blueghost75

Golden Member
Dec 12, 2000
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what is throwing me off is the f(t) and the f(x) on the right side of the equation.....that seems to make it recursive? i hate those....

i could be totaly off here.....
 

webnewland

Golden Member
Apr 21, 2001
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it's not really recursive. The integral part was my teacher adding BIG difficulty to the question. so is the f(x) on both side
 

b0mbrman

Lifer
Jun 1, 2001
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First step is:

f(1) = 5 - (t^2)(f(t))(dt)(integral(f(1)))

but that's where I don't want to think anymore