Quadratic Equations! Pls help!

**Zara** · April 16th 2008, 08:12 AM

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

**skystar** · April 16th 2008, 08:25 AM

need to refine your question a bit more..

$1/x +x$ will always =1

**janvdl** · April 16th 2008, 08:26 AM

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 $x$

**janvdl** · April 16th 2008, 08:28 AM

Originally Posted by skystar

need to refine your question a bit more..

$1/x +x$ will always =1

Wouldn't that apply to multiplication?

**Zara** · April 16th 2008, 08:55 AM

Hey Thanks a million

**janvdl** · April 16th 2008, 08:57 AM

Originally Posted by Zara

Hey Thanks a million

You are welcome

Thread: Quadratic Equations! Pls help!