• Apr 16th 2008, 08:12 AM
Zara
I need to find a number such that the sum of the number and its reciprocal is 20. Anyone, pls?
• Apr 16th 2008, 08:25 AM
skystar
need to refine your question a bit more..

$1/x +x$ will always =1
• Apr 16th 2008, 08:26 AM
janvdl
Quote:

Originally Posted by Zara
I need to find a number such that the sum of the number and its reciprocal is 20. Anyone, pls?

$x + \frac{1}{x} = 20$

$x^2 + 1 = 20x$

$x^2 - 20x + 1 = 0$

You can now use the quadratic formula to calculate the values for $x$ ;)
• Apr 16th 2008, 08:28 AM
janvdl
Quote:

Originally Posted by skystar
need to refine your question a bit more..

$1/x +x$ will always =1

Wouldn't that apply to multiplication?
• Apr 16th 2008, 08:55 AM
Zara
Thank you!
Hey Thanks a million :)
• Apr 16th 2008, 08:57 AM
janvdl
Quote:

Originally Posted by Zara
Hey Thanks a million :)

You are welcome :)