Posted by **avincent** on Wednesday, February 27, 2008 at 11:56am.

w=Cr^-2 solve for r

- Alegebra -
**DrBob222**, Wednesday, February 27, 2008 at 12:14pm
w = Cr^-2

w = C/r^2

wr^2 = C

r^2 = C/w

r = +/- sqrt (C/w)

Check mu work.

- Alegebra -
**avincent**, Wednesday, February 27, 2008 at 12:17pm
i came up with r=sqrt of C/w

what is the +/- for ? could it be either positive or negative?

- Alegebra -
**DrBob222**, Wednesday, February 27, 2008 at 12:50pm
ANYTIME you take the square root of something, you get a + or -. Let me show you why.

Take the square root of 4. That is 2. Now if we multiply +2 x +2 we get +4. BUT if we multiply -2 x -2 we also get +4. So the square root of 4 is +/- 2. Same with anything else because a minus number x a minus number = a + number.

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