find a function f and a number a such that 6+ integral of t=x to t=a f(t)/t^2dt = 2square root x for all x>0.

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- November 29th 2008, 03:08 PMtwilightstrurgent hw help on calculus
find a function f and a number a such that 6+ integral of t=x to t=a f(t)/t^2dt = 2square root x for all x>0.

- November 29th 2008, 03:19 PMskeeter
- November 29th 2008, 06:41 PMtwilightstrstill need help
i still dont know what to do from there. srry

- November 29th 2008, 10:32 PMmr fantastic
- November 29th 2008, 11:48 PMtwilightstr
its actually -6+ 2rootx but no worries i still understand it

thanks - November 29th 2008, 11:55 PMmr fantastic
- November 30th 2008, 12:47 AMtwilightstr
in the given problem, the upper bound is x and the lower bound is a.

- November 30th 2008, 02:22 AMmr fantastic
I do realise that.

Are you familiar with the following property:

.

That's the property I used.

If you're familiar with the Fundamental Theorem of Calculus (see post #2) then you will understand why the integral terminals in your question need to be reversed before the integral can be differentiated. - November 30th 2008, 11:39 AMtwilightstr
the answer in the book is f(x)= x^3/2 and a=9