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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- Nov 29th 2008, 04:08 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.

- Nov 29th 2008, 04:19 PMskeeter
- Nov 29th 2008, 07:41 PMtwilightstrstill need help
i still dont know what to do from there. srry

- Nov 29th 2008, 11:32 PMmr fantastic
- Nov 30th 2008, 12:48 AMtwilightstr
its actually -6+ 2rootx but no worries i still understand it

thanks - Nov 30th 2008, 12:55 AMmr fantastic
- Nov 30th 2008, 01:47 AMtwilightstr
in the given problem, the upper bound is x and the lower bound is a.

- Nov 30th 2008, 03:22 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. - Nov 30th 2008, 12:39 PMtwilightstr
the answer in the book is f(x)= x^3/2 and a=9