# Quick help needed

• April 17th 2008, 11:49 PM
dipsy34
Quick help needed
I cant solve this, and need some quick help.

4*pi*X+2000/x^2=0

How do I simplify these two?

2X(1000/x2+2x)
2(x+2)(1000/x2+2x)
• April 17th 2008, 11:59 PM
CaptainBlack
Quote:

Originally Posted by dipsy34
I cant solve this, and need some quick help.

4*pi*X+2000/x^2=0

How do I simplify these two?

2X(1000/x2+2x)
2(x+2)(1000/x2+2x)

Solve:

$4 \pi x+2000/x^2=0$

multiply through by $x^2$:

$4 \pi x^3+2000=0$

rearrange:

$x^3=-~\frac{500}{\pi}$

and you should be able to take it from there.

(for the others first multiply out the brackets)

RonL